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re what do nuclear site s cooling towers do nagle netcom com john nagle writes great explaination however you left off one detail why do you always see them at nuclear plants but not always at fossil fuel plants at nuclear plants it is prefered to run the water closed cycle whereas fossil fuel plants can in some cases get away with dumping the hot water as i recall the water isn t as hot thermodynamically in many fossil fuel plants and of course there is less danger of radioactive contamination actually the reasons you don t see so many cooling towers at fossil plants are fossil units multiple units per plant are generally smaller than nuclear plants mwe seemed to be a very popular size when many fossil plants were built the average nuclear plant is mwe many fossil plants were grandfathered when water discharge regulations were adopted why those old dirt burners can t harm anything let em go powered draft cooling towers low enough to the ground to be generally not visible from off site are quite popular with fossil plants fossil plants used to get much less regulatory attention than nuclears actually fossil fuel plants run hotter than the usual boiling water reactor nuclear plants there s a gripe in the industry that nuclear power uses vintage steam technology so it s more important in nuclear plants to get the cold end of the system as cold as possible hence big cooling towers oil and gas fired steam plants also have condensers but they usually are sized to get the steam back into hot water not most of the way down to ambient some plants do cool the condensers with water rather than air as one canadian official asked about thermal pollution de icing a river said up here we view heat as a resource actually the condensing environment is essentially the same for plants of similar size the issues are the same regardless of where the heat comes from condensers are run at as high a vacuum as possible in order to reduce aerodynamic drag on the turbine the condenser pressure is normally water s vapor pressure at the condensing temperature it is desirable that the steam exhaust be free of water droplets because moisture in the steam causes severe erosion damage to the turbine low pressure blades and because entrained water moving at high velocity causes erosion of the condenser tubes the coldest and thus lowest pressure condensing environment is always the best a related issue is that of pumping the condensate from the hotwell where the water ends up after dripping off the condenser tubes since the condenser is at a very low pressure the only force driving the condensate into the hotwell pumps is gravity if the condensate is too hot or the gravity head is too low the condensate will reflash into steam bubbles and cause the condensate pumps to cavitate this is a particularly destructive form of cavitation that is to be avoided at all costs the hotwell pumps are located in the lowest point in the plant in order to provide a gravity head to the pumps how much lower they must be is a function of how hot the water is allowed to get in the hotwell typically hotwell temperatures run between and degrees depending on the temperature of the river water this term is used to describe the river grade water even when the cooling tower system is operating in closed loop mode and essentially no river water is pumped when the river water temperature is high in the summer operators will typically allow the hotwell level to rise in order to provide more gravity head there is a tradeoff involved since higher hotwell levels will encroach onto the condensing tubes and reduce the condenser area at least in the east and elsewhere where moisture actually exists in the air the river water will almost always be cooler than the discharge water from the cooling towers the temperature of the discharge water from the cooling towers is set by the ambient air temperature and humidity it is very rare in the east to hear of actual river water temperatures exceeding degrees a vast difference from the typical days degrees humidity we see routinely in the east it is not unusual particularly where the econazis have been successful in clamping rigid discharge water temperature limits on a plant for the plant to have to reduce the firing rate when the air temperature gets too high and the condenser cannot handle the heat load without excessive pressure everybody runs closed cycle boilers the water used is purified of solids which otherwise crud up the boiler plumbing when the water boils purifying water for boiler use is a bigger job than cooling it so the boiler water is recycled true actually secondary plant the part that makes electricity and feeds feedwater to the boiler water chemistry has been the bastard stepchild until recently and has not gotten the respect it deserves the plant chemists have just in the past decade or so fully understood the costs of impure water by impure i mean water with a few dozen extra micromho of conductivity and or a few ppm of dissolved oxygen secondary water is now typically the most pure one will find outside the laboratory john john de armond wd oqc interested in high performance mobility performance engineering magazine tm interested in high tech and computers marietta ga send ur snail mail address to jgd dixie com perform dixie com for a free sample mag lee harvey oswald where are ya when we need ya
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re what is zero db in article apr bnr ca moffatt bnr ca john thomson writes joseph chiu josephc cco caltech edu wrote and the measure of current amp is actually named after both the amp company and the amphenol company both companies revolutionized electronics by simulatenously realizing that the performance of connectors and sockets were affected by the amount of current running through the wires sorry the unit for current is the ampere which is the name of a french man named ampere who studied electrical current the term amp is just an abbreviation of it the company amp came after the ampere unit was already in use the ohmite company was the first to characterize resistances by numbers thus our use of the ohms i don t know about this one but it doesn t sound right are you two joking is the entire internet flaming you two ahh now i remember that ohmite company was the first introducing the pink colored resistor only for electronics working females manuel arrevola velasco true e mail manolo taf fundesco es dod
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re adcom cheap products aaron lung alung megatest com wrote i was also sceptical about the amps being built in the far east or where ever but if you look in the amp and see what components they use and how it was designed you can easily see why the amplifiers sound so brilliant good point also i wouldn t be surprised that the components they use off shore are of inferior quality as long as it was properly designed and robust premium components are used it shouldn t matter where it is assembled definately i agree wholeheartedly if they can build the amp where the labour is not so expensive they can afford to put decent components in and go to more effort to improve the design of the amplifier as adcom has done i cannot see why people say the amplifier won t last not with those quality components inside sure the amp runs very fairly hot but that s how you get an amp to sound incredibly good an amp that runs hot has no bearing on how it s gonna sound the amp you have probably is running class a the whole day actually i d be wary of excessively hot amps cauz even though the components inside may be rated to run that way excessive heat will dramatically shorten the life of any electronic component regardless of quality in fact an amp that does run hot to the touch is because either the engineer or manufacturer of that amp wanted to skimp on heatsinking or cooling to save costs hmmmmm sure i didn t mean to imply that because of the heat generated the amp sounds good my adcom gfp ii runs fairly warm not hot to the touch but enough to satisfy me that the amp is running nicely i don t like it when an amp runs dead cold it makes one think that the amp is doing nothing the heatsinks that adcom uses in their amps are certainly far for skimpy they re massive things with heating vents both below and above more than enough to carry away excessive heat my opinions once again alan webber webb itu sun ac za webb itu sun ac za the path you tread is narrow and the drop is sheer and very high the ravens all are watching from a vantage point near by apprehension creeping like a choo train up your spine will the tightrope reach the end will the final couplet rhyme
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re what s a good ic for rs ttl signals in article c nz z scraps uucp frankh scraps uucp frank holden ka uww writes in c zsc fl news cso uiuc edu rky uxa cso uiuc edu tall cool one writes i m looking for an ic that will convert rs voltage levels to ttl voltage levels something relatively inexpensive would be nice too anyone have a suggestion thanks well it looks as if digi key sells a chip with the number icl that does what you want they are selling it for about digi key also sells quad line receivers parts ds an cents and ds n cents a quad line driver part ds cents is also sold i guess if you don t won t to supply v the chips with the pump up circuitry might be worth the extra cost but s and s are available at your friendly neighborhood rs parts mc for and mc for jeff white jhwhit ulkyvx louisville edu
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re motorola xc rc and rc in article apr rosie uh edu st my rosie uh edu stich christian e writes i just installed a motorola xc rc fpu in an amiga a board mhz with capability to clock the fpu separately previously a mc rc was installed and everything was working perfectly now the systems displays a yellow screen indicating a exception when it check for the presence type of fpu when i reinstall an mc rc the system works fine but with the xc even at mhz it does not work the designer of the board mentioned that putting a pullup resistor on data strobe ohm might help but that didn t change anything does anybody have some suggestions what i could do does this look like a cpu fpu communications problem or is the particular chip dead it is a pull not new moreover the place i bought it from is sending me an xc rc i thought that the rc were labeled mc not xc for not finalized mask design are there any mc rc thanks christian have you changed the crystal that clocks for the fpu if you haven t then it won t work conrad
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re single chip receiver for fsk in article c l xm e law daytonoh ncr com jra law daytonoh ncr com john ackermann x writes my goal is to come up with an inexpensive design for a receiver back end with if input on one end and an fsk demondulator on the other i m particularly interested in ways to use a higher if than do any current chips work up to say mhz with internal downconversion so a normal if filter can be used gec plessey specify a series of fm demodulators sl etc for use in satellite tv receivers or mhz in mhz of baseband video out i think there s also a related data slicer clock recovery circuit intended for use in dmac decoders though that isn t used in the most common implementation it may not be in volume production the most easily available components probably vary with local satellite standards and i think the european systems vary rather widely from those in the us so it may be worth investigating locally available receiver designs to find out what s in common use adrian adrian godwin agodwin acorn co uk adrian fangorn demon co uk g hwn gb khw obdisclaimer i believe this rubbish don t imagine that anyone else does
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references to switched capacitor filter ics wanted hi all i would like to know what are the popular ics of the type their capabilities of channels et c and prices great thanks andrew
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re dmm advice needed kolstad cae wisc edu joel kolstad writes in article aa insane apana org au peter m insane apana org a if you are going to use one where it counts eg aviation space scuttle etc then i suggest you go and buy a fluke never seen a beckman however for every other use you can buy a cheapie my beckman died a few days ago thanks do about a or foot drop onto a lab table probably not indicative of anything but i ve already filled out the requisition for a fluke oh yeah and sometimes our measurements here do count not often but often enough that i want at least one good meter joel kolstad we used to buy beckman and hd ruggedized versions for use by electricians in the steel mill where i work after a while we got round to filling all the current input jacks with silicone electricians have a regrettable habit of not checking where the last guy left the leads before using a digit autoranging meter to check if a fuse is good or not its very hard on meters and electricians when you put the milliamp shunt across a volt bus but that s not why we stopped buying beckmans after a while a lot of them got funny in the lcd display a black stain would spread from one edge or else they d come adrift from those zebra connectors and fail to operate now we buy flukes the low end series mostly and we still fill the amp jack with silicone what the world needs is a meter that won t let you change ranges or turn it on off with a lead stuck in the amps jack a little bit of clever plastic detailing would take care of this and make the world safer for electricans anyway not that i ve ever put a meter on the wrong range into a live circuit no not me not more than a dozen times anyway bill bills inqmind bison mb ca the inquiring mind bbs winnipeg manitoba
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sale fiber optic modems rf modem etc best offer please take these and use them take advantage of me i really don t know what they are worth qty canoga perkins fiber optic modems model rs interface appear new i have powered up but that s all i have not used them and i cannot tell you whether they work or not make offer qty isc datacom rf modem model tx rx sm interface rs internal fan powers up fine but otherwise condition unknown phone for the company is make offer qty motorola uds a d modem rs interface appears to work but i have not and cannot check it make offer thanks and please buy this stuff or it goes out the door mack mdgoodma cbda apgea army mil
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f y i imagewriter to windows article crossposted from comp windows ms author was kevin routh posted on apr gmt for your information i hooked up my imagewriter i to my com serial port and used the c itoh driver in windows the cable i am using is a straight thru cable connected to a null modem adapter i got at radio shack catalog a for it seems to work fine with both dos and windows i used the following command in dos c dos mode com n p and set up the port the same way in the windows ports setup the null modem connections are as follows to to to to to to to to i printed from several applications and all seems ok kevin c routh internet krouth slee srl ford com ford electronics ibmmail profs usfmctmf eld ic engineering rotunda drive b voice mail dearborn mi facsimile kevin c routh internet krouth slee srl ford com ford electronics ibmmail profs usfmctmf eld ic engineering rotunda drive b voice mail dearborn mi facsimile kevin c routh internet krouth slee srl ford com ford electronics ibmmail profs usfmctmf eld ic engineering rotunda drive b voice mail dearborn mi facsimile
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info wanted graphics lcd displays hi there does anyone know how to get hold of data as well as stock of the lcd displays used in the nintendo gameboy handheld tv game machines any information wouold be most appreciated please e mail any replies to arawstorne eleceng uct ac za thanks alex
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pace modem hi i ve got a pace modem series four s made in england by pace micro technology with a broken power supply so i d like to know the voltage and current values of the original power supply ps the pinout of the power supply connector the pinout of the user port and how to use it many thanks in advance to all the people help me please post the reply also to my e mail sender stefano mora email mora verdi eng unipr it
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telephone controlled power bar needed i would appreciate some help in locating a telephone controlled power bar for my pc the unit would power up the pc when the telephone rings and keep it up as long as the telephone connection is present i also need to be able to power up this same pc through the use of an external timer i can supply power or a contact closure to do this i will summarize and post the results of this query here thank you dan gould gould waterloo hp com
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re how starters work really so when you turn on the power this causes the bulb to work like a neon imprecise this description ignores the role of the ballast misrepresents the heating effects in the starter the bimetalic strip cools down immediately after the contacts i ve been thinking of sending into mad magazine an idea for a parody of those books entitled how things work that engineers buy their sons which explain how engines elevators flourescent lights etc work the parody would be how things really work under canned food on the left page you d see the description from how things work gleaming stainless steel equipment pasteurizing the food to precisely the right temperature then sealing the can in an oxygen free environment etc on the right page you d see how things really work brain dead workers sending disgusting food to the gleaming equipment rotting vegetables parts of animals people don t eat barrels of sugar and chemicals under elevators you d see on the left computer geniuses working out algorithms so that x number of people waiting for y elevators will get to z floors in the shortest time on the right you d see giggling elevator controllers behind a one way mirror in the lobby choosing which people appear to be in the biggest hurry and making them wait longest why my thoughts are my own when they are in but when they are out they are another s susannah martin hanged for witchcraft thomas david kehoe kehoe netcom com
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re history question in article snap paj uk co gec mrc paul johnson writes i recall reading of a phonograph which used mechanical amplification compressed air was squirted out of a valve which was controlled by the pickup the result was noisy and distinctly lo fi but much louder than a conventional phonograph it tended to wear the disks out pretty quickly though this was the pathe you are thinking of although there were other imitators it didn t wear the disks any more than conventional acoustic designs but it did have a high noise level due to the continual hiss of escaping air there are a lot of them still operating and they are pretty ingenious there was a pneumatic amplifier designed by alexander graham bell as well but i don t know if it was ever constructed scott
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re need to find out number to a phone line in article bd dea ecs umass edu alee ecs umass edu writes greetings situation i have a phone jack mounted on a wall i don t know the number of the line and i don t want to call up the operator to place a trace on it question is there a certain device out there that i can use to find out the number to the line call a friend long distance collect ask to speak with yourself when the operator asks for you you won t be there so ask the operator to leave your number she ll read it out in the clear scott
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re subliminal message flashing on tv in article hpfcso fc hp com myers hpfcso fc hp com bob myers writes hi i was doing research on subliminal suggestion for a psychology paper and i read that one researcher flashed hidden messages on the tv screen at ths of a second is that possible i thought the maximum rate the tv was even capable of displaying images was th of a second or th of a second for an image composed of only odd or even scan lines you are correct the fastest complete image that could be presented on tv would be one field which is of a second approximately of course the phrase tv screen is often thrown around in reference to any crt display so perhaps this researcher wasn t using normal tv rates might even be a vector strokewriter display in which case the lower limit on image time is anyone s guess and is probably phosphor persistence limited actually a lot of this work used to be done with a crt that had a beamsplitter mounted in front and a tachistoscope driving it the tachistoscope is really just a slide projector with a very fast shutter low tech but it does the job scott
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mysterious mosfet i have a mosfet pulled out of a trygon power supply for which i have no manual it s a motorola part with a date code and the number which the motorola folks assure me is a house number which they can t help me with any suggestions from folks out there i can t put it on a curve tracer to try to get an equivalent since it s completely shot scott
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how does differential mode gps work i understand that the new gps boxes now have an option known as differential ready apparently land based beacons tranmit gps correction information to your gps receiver with differential option installed how does this system work what frequency is used for the land based beacons thanks in advance charlie thompson here s a rough sketch of how the system works a reference station with a very exactly known position computes the errors in the incoming gps signals these errors are due to several factors including atmospheric distortion sa selective availability time dithering etc the reference unit contains complex computational equipment to back out the errors in its position since it knows where it is already it then transmits these corrections on a broadcast which is available to any number of relatively local receivers if the receivers are nearby km and are using the same satellites as the reference unit the errors should be very similar for the reference unit and the receiver unit thus the receiver unit may apply the corrections calculated by the reference unit the us coast guard is currently as far as i know installing a series of coastline transmitters for differential gps these stations will use existing radio towers i believe the frequency is to be approximately khz there are many other private corporations offering dgps signals on different frequencies for example pinpoint offers correction signals and receiver units using an fm broadcast system which has stations all across the us the correction codes are usually transmitted using the rtcm format advertised accuracies espouse to meter errors john p baker my opinions are my own i don t know johns hopkins university anyone else who wants them anyway applied physics laboratory laurel md bakerjp aplcomm jhuapl edu
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new applications of electronics i m looking for brief information on new applications of electronics or new electronics in applications if you know of any interesting new stuff i would be intrested in hearing about it thanks mjh
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dayton hamfest some weeks ago someone posted an article telling when and where a hamfest and computerfest was going to be help in dayton oh unfortunately i lost the article and i was wondering if someone could repost it i believe it was being held the and of this month at the dayton convention center but i m not sure any help and more details would be greatly appreciated george d hodge domain cbcat att com
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re what do nuclear site s cooling towers do i really don t know where to post this question so i figured that this board would be most appropriate try sci energy jeff babb babb sciences sdsu edu babb ucssun sdsu edu programmer sdsu larc
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bit serial converters someone was looking for these a few weeks ago check out comp dsp mike
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re getting rid of screen wiggles in article qpj t itg vela acs oakland edu eabyrnes vela acs oakland edu ed byrnes wrote my monitor display has a bad case of the wigglies i have a good ground i live in an old house and i have replaced much of the wiring i have two emi filters on the computer the monitor plugs into the computer when fluorescent lights are on upstairs the display jiggles when motors run in the house the display jiggles when incandescent lights are on in the kitchen the display jiggles i could bring a separate line from the breaker box and use it only for the computer would this do it emi doesn t only travel the volt line though should i shield the back of the monitor ground a grid or plate your expertise is appreciated thanks very much ed byrnes aaahh a problem very near and dear to my heart in our case other monitors cause this problem the deflection coil of other monitors to be specific have also seen a monitor backed up to a fuse panel exhibit this problem this sounds like your problem since flourescent lites motors etc several s of feet away seem to me to be too far to cause it but the juice running to them must pass nearby your monitor fusebox on other side of wall maybe we started spec ing panasonic ct y video monitors switchable input lines vid aud s vhs on one this stopped the wavy interference effect on the computer monitor next to it now on to your problem you need what is known as mu shielding very common in fact almost mandatory on electrostatic deflection type o scopes i talked to a ee prof he said get a coffee can cut both ends off mount around deflection coil of interfering monitor be careful to avoid all high voltage circuitry especially the thicker high voltage anode lead usually colored red if you kill yourself don t blame sue me use plastic or other non conducting stand offs and such to mount can now i would assume that what is good for keeping mag fields in is also good at keeping them out so hopefully this ll work by mounting shield on monitor being interfered with as well if not start shielding those other sources jeff babb babb sciences sdsu edu babb ucssun sdsu edu programmer sdsu larc
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food dehydrators does anybody out there have one of those food dehydrators i ve been seeing all over late night tv recently i was wondering if they use forced air heat or both if there s heat involved anybody know what temperature they run at my wife would like one and i m not inclined to pay for a box a fan and a heater seems to me you should be able to throw a dehydrator together for just a few bucks heck the technology is only what years old john
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re need to find out number to a phone line well this is my second try at posting on this subject here goes in texas corpus christi at least if you pick up the phone and dial the phone company will read the number of the phone you are on back to you i believe the service department uses this to make certain they are repairing the correct lines when they open the big junction boxes i don t know if it will work but you can give it a try good luck
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suggestions on audio relays i built a little project using the radio shack vdc relays to switch audio i got pretty bad clicks when the thing switched i was doing most of the common things one is supposed to do when using relays and nothing seemed to get rid of the clicks my question is is there a good relay relay circuit that i can use for switching audio so that there will be no noise of any kind on the audio lines i will appreciate any advice or references to advice also exact part numbers company names etc for the relays will help thanks bill quinn billq ms uky edu
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re what do nuclear site s cooling towers do in article qngqlinnnp shelley u washington edu whit carson u washington edu john whitmore writes in article c l x kj vcd hp com johne vcd hp com john eaton writes s s walker man swalker uts edu au wrote during the nuclear fission reaction the uranium fuel can get hot enough to melt when this happens the liquid uranium is pumped to the cooling tower where it is sprayed into the air contact with the cool outside air will condense the mist and it will fall back to the cooling tower floor there it is collected by a cleaning crew using shop vacs and is then reformed into pellets for reactor use the next day another april posting ahhh mark e levy fermilab bitnet levy fnal unix is to computing internet levy fnald fnal gov as an etch a sketch is to art hepnet span fnald levy vms
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re radar detector detectors in article apr bmers bnr ca alee bmerh bnr ca louis leclerc writes in article oasys dt navy mil you write va ct wash dc and i think bc canada where i ve heard they actually use radar detector detectors nope not in british columbia detectors are legal here in bc i ve even got one in alberta and ontario they re illegal and detection devices are sometimes used i ve heard the police in ontario prefer a much more direct method of detection just trigger the radar gun watch for people slamming on the brakes and search the car david lee leex sfu ca detectors are legal in alberta the old law was overturned a long time ago stan burton dnd crad dres dtd mss agcg sburton dres dnd ca dre suffield box medicine hat ab canada t a k
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wireless transmitter receivers at rs does anyone know what frequencies the wireless transmitter receiver microphone systems that radio shack sells operate at i ve tried everything short of opening one up not actually owning one makes this difficult and just looking any help would be greatly appreciated these systems are designed for wireless pa systems etc thanks tracy
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re motorola xc rc and rc in article apr rosie uh edu st my rosie uh edu stich christian e writes i just installed a motorola xc rc fpu in an amiga a board mhz with capability to clock the fpu separately previously a mc rc was installed and everything was working perfectly now the systems displays a yellow screen indicating a exception when it check for the presence type of fpu when i reinstall an mc rc the system works fine but with the xc even at mhz it does not work the designer of the board mentioned that putting a pullup resistor on data strobe ohm might help but that didn t change anything does anybody have some suggestions what i could do does this look like a cpu fpu communications problem or is the particular chip dead it is a pull not new moreover the place i bought it from is sending me an xc rc i thought that the rc were labeled mc not xc for not finalized mask design are there any mc rc thanks christian it appears as if the problem is related to the s need for very fast and clean signal transitions i got some email vielen dank thomas stating that motorola provides a solution for this problem in their manual since my manual predates the mhz s i couldn t find it could someone please email me the specifics thanks christian
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re microcontroller in article qppr innaqa dns nmsu edu mcole spock cole writes i would like to experiment with the intel family does anyone out there know of any good ftp sites that might have compiliers assemblers etc well it s not an ftp site but i got an number for signetics bbs the signetics bbs contain some pretty good items for the i am currently using the following files which i downloaded from them ml asm zip metalink s family macro assembler bootstrp zip hex file load and go using uart allows you to download your program into a ram and then execute from ram works great tell me if you want more details tutor zip tsr for feature help screens they have lots of coding examples assemblers and misc tools signetics bbs numbers are have fun mont pierce ham call km wt internet mont netcom com bands ibm vnet mont vnet ibm com modes cw ssb fm
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re help how to construct home built battery for rd grade sci report dean anneser anneser pwa b uucp wrote my yr old son has signed up to do a science report on batteries i was wondering if anyone could provide me with some information as to how to construct a home built battery in my grade school days i remember seeing the ice cube tray version but i don t remember what to use as a good electrolyte or what the easily obtainable metals were thank you in advance i remember watching a whole mr wizzard program on this subject when i was a kid the battery constructed on the program which made the biggest impression on me and generated the most power was made using a galvanized bucket for the zinc and a copper toilet tank float the electrolyte was sauerkraut donald borowski wa omi hewlett packard spokane division angels are able to fly because they take themselves so lightly g k chesterton
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need pinouts for a g dtmf decoder chip i bought this chip from suncoast technology and tried to build their dtmf decoder circuit but it s not working if anyone has the pinouts and possibly the voltage specs i d sure appreciated it if someone could fax email or snail mail a copy of the spec sheet for this chip that would be even better please email me if you can help thanks in advance mont pierce ham call km wt internet mont netcom com bands ibm vnet mont vnet ibm com modes cw ssb fm
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cicuit cellar ink extras trade fellow info junkies i have an extra cci real time programming embedded sensors storage and an extra cci voice control of telescope among other articles no labels no torn cut up or missing pages would like to trade for cci or cci or cci in same condition labels ok i mail mine you mail yours mutual trust kinda thang ok you don t actually throw them away do you thanx jeff babb babb sciences sdsu edu
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re need to find out number to a phone lin in article qub minn r rave larc nasa gov kludge grissom larc nasa gov scott dorsey writes in article bd dea ecs umass edu alee ecs umass edu writes greetings situation i have a phone jack mounted on a wall i don t know the number of the line and i don t want to call up the operator to place a trace on it question is there a certain device out there that i can use to find out the number to the line call a friend long distance collect ask to speak with yourself when the operator asks for you you won t be there so ask the operator to leave your number she ll read it out in the clear scott even easier my area supports dial this and a recording recites your number phone techs use it to verify an installed line gary gendel vice president current consulting assignment genashor corp mentor graphics corporation piney woods drive independence boulevard belle mead nj warren nj phone phone fax email garyg warren mentorg com
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does someone know what is the news group for ieee yxy usl edu thanks a lot
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looking for address of noise cancellation tech i am new to this newsgroup so i apologise if this is not the appropriate forum to ask this question i am looking for the address of noise cancellation technologies it is rather important so if you can help me in this regard please do thank you rosli khairon aludra usc edu
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re motorola xc rc and rc in article sgberg xu charon bloomington in us sgberg charon bloomington in us stefan berg writes i don t know why my fpu has an xc my original mhz fpu was label mc but it seems to work fine on my system p s or does it mean experimental chip instead of motorola chip the rule for the designations is that if it says mc that means it works exactly the way the datasheet book specifies if it says xc that means there is at least one known bug often these bugs are small and obscure you might never run into them in practice at least motorola admits it unlike certain other companies all work is one man s work henry spencer u of toronto zoology kipling henry zoo toronto edu utzoo henry
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re mysterious mosfet in article qug sinn g rave larc nasa gov kludge grissom larc nasa gov scott dorsey writes i have a mosfet pulled out of a trygon power supply for which i have no manual it s a motorola part with a date code and the number which the motorola folks assure me is a house number which they can t help me with any suggestions from folks out there i can t put it on a curve tracer to try to get an equivalent since it s completely shot scott since your mosfet is a vintage it s probably not a very good one by today s standards if you have an idea about its voltage and current ratings e g vdc a you can probably get away with replacing it with anything with better specs early mosfets had a gate source voltage rating of approximately vdcmax and they would usually turn completely on at vdc otherwise mosfets are not really mysterious they re more or less voltage controlled current sources if the mosfet in your circuit is used as an open loop voltage controlled current source you may have to experiment with various gain altering techniques bill willis willisw coe nw clemson edu
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common mode noise and small signals i have never worked with really small signals before and have a few questions about low level noise i have noticed that the waveform synthesizer that i am using analogic has some relatively large common mode noise on it i am using this synthesizer to null out another transient waveform and am amplifying the difference uv several hundred times the has about mvp p of common mode noise and this tends to make my measurements hard to repeat the noise is not quite in sync with line frequency and on a spectrum analyzer the main component is about hz how can i get rid of the noise when i look at the spectrum using an hp a audio range analyzer the noise goes away the minute i switch to isolation on the input i am guessing the anlayzer has a diff amp on the input since it will read accurately down to dc also if i use a differential amplifier ia to solve the problem how important is it to use one of these shield drivers an amp connected to the shield in sort of a feedback loop to remove trouble caused by different cable capacitances if anyone can suggest a good ic ia for use with transient signals with content from khz to about khz i would appreciate it
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re microcontroller mcole spock cole writes i would like to experiment with the intel family does anyone out there know of any good ftp sites that might have compiliers assemblers etc try lyman pppl gov pub brian day bday lambda msfc nasa gov new technology inc mission software development division opinions are my own
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re dayton hamfest yes it is the and in but does anyone have directions how to get there after i get to dayton thanks wayne martin
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re electronic odometers was used bmw qu just a few comments about the feasability of zipping up a bunch of miles on your electronic odometer with an oscillator i wouldn t expect to be able to do this not because the engineers at bmw are putting in anti fraud logic but just because an automobile is a noisy hostile environment for electronics and i would expect the software to be conservative if i were to design a microprocessor based odometer speedometer program it would have the following features just off the top of my head debouncing deglitching is this a real pulse or just a glitch smoothing the rate of change of speed cannot be too high this is a car not an electron top speed limit anything above mph is ridiculous must be electrical noise or contact bounce as for getting in and presetting the pins if this is the circuit board out of a bmw dashboard i seem to remember a single big chip with lotsa pins in the middle of the card good luck getting at the counter i wouldn t expect a high input frequency to damage the meter remember it s probably damped so it can t move too fast and is probably protected after all a car is an extremely hostile place for delicate electronics there used to be an app note in the national semiconductor linear databook that went into this in good detail jerry kaidor tr jerry dragoman com jkaidor synoptics com jerry kaidor
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next cube board monitor cable hi all quick question could someone please send me a pinout of the cable that goes between a next cube and the monitor also i am interested in the video signal sync type horz vert rate so any information on that would be greatly appreciated also thanks ryan brooks ryan agnus mcs mu edu
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re need to find out number to a phone line in article bd dea ecs umass edu alee ecs umass edu writes greetings situation i have a phone jack mounted on a wall i don t know the number of the line and i don t want to call up the operator to place a trace on it question is there a certain device out there that i can use to find out the number to the line thanks for any response al there is a number you can call which will return a synthesized voice telling you the number of the line unfortunately for the life of me i can t remember what it is the telephone technicians use it all the time we used to play around with this in our dorm rooms since there were multiple phone lines running between rooms sorry aaron
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mc sbi mixer hi i was wondering if anyone would be able to help me on twwo related subjects i am currently learning about am fm receivers and recieving circuits i understand a lot of things but a few things i am confused abuot the first is the mixer to mix the rf and local oscillator frequencies to make the if does anyone have any cicruit diagrams as simple as possible for this kind of mixer i have come across a mc sbl mixer chip but i have not been able to find it in any catalogs active etc along the same note are there any simple fm receiver circuits anyone may have stashed away somewhere and they couold let me see p s any really good books on am fm theory along with detailed electrical diagrams would help a lot i have seen a lot of theory books with no circuits and a lot of circuit books with no theory but one without the other does not help thanks mark musone
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sources for intel d c fb i am in the midst of designing a project which requires two motors and an led illuminator driven with pulse width modulation i m using the and i understand that the fb version has a programmable counter array that can essentially be set and forgotten to do the pwm the problems is that variant is difficult to come by i need two or three of the d prefix ceramic window version for development and then lots of the p prefix plastic otp for later production i ve tried avnet arrow and pioneer they might have them but i m looking for samples at this point and they re not too willing to provide them i would buy them but these vendors have minimums any help is appreciated mark e levy fermilab bitnet levy fnal unix is to computing internet levy fnald fnal gov as an etch a sketch is to art hepnet span fnald levy vms
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re pinout needed for til in article segal corolla segal rtsg mot com gary segal writes i ve recently picked up some til display chips but i can t find any information on them it seems they are no longer made by ti and i don t have an old enough data book it appears to have a dot matrix led display capable of showing one hex digit it is in a pin dip package but pins and are not present if you have any information on this part pinout power requirments functions please send me e mail thank you gary segal motorola inc segal oscar rtsg mot com cellular infrastructure division we are standing here only to gaze at the wind pin function led supply voltage latch data input b latch data input a left decimal point cathode latch strobe input omitted common gnd blanking input omitted right decimal point cathode omitted latch data input d latch data input c logic supply voltage v latch strobe input pin when low the data in the latches follow the data on the latch data inputs when high the data in the latches will not change if the display is blanked and then restored while the enable input is high the previous character will again be displayed blanking input pin when high the display is blanked regardless of the levels of the other inputs when low a character is displayed as determined by the data in the latches the blanking input may be pulsed for intensity modulation latch data inputs pins data on these inputs are entered into the latches when the enable input is low the binary weights of these inputs are a b c d decimal point cathodes pins these leds are not connected to the logic chip if a decimal point is used an external resistor or other current limiting mechanism must be connected in series with it led supply pin this connection permits the user to save on regulated vcc current by using a separate led supply or it may be externally connected to the logic supply vcc logic supply vcc pin separate vcc connection for the logic chip common ground pin this is the vegative termnal for all logic and led currents except for the decimal points john jott dickens helios nd edu
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modulation over rf i would like to modulate a khz squarewave over rf this is for a rf remote control project the squarewave has a high of v and low of v thanks tron t t t t t t t t t
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need source for old radio shack stereo amp chip last week i asked for help in getting an old homemade amp working with my sun cd rom drive it turns out that the channel i was testing with was burned out in the amp the other channel works fine so now i need a new amplifier chip my local radio shack no longer carries components the chip is a pin sip labelled with ba and then below that does anyone have a source thanks bill morrow clinical neurosciences university of calgary e mail morrow cns ucalgary ca voice fax hospital drive nw calgary alberta canada t n n
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re help how to construct home built battery for rd grade sci report in article c qui cf spk hp com borowski spk hp com don t borowski writes dean anneser anneser pwa b uucp wrote my yr old son has signed up to do a science report on batteries i was wondering if anyone could provide me with some information as to how to construct a home built battery in my grade school days i remember snip i haven t been following this so i m sorry if somebody already mentioned this but you could grab a lemon i think potatoes work too but i m not sure a strip of copper and a strip of zinc i think you can get the metal in a hardware store or hobby shop maybe stick the strips in the lemon so they don t touch and you ll get a measurable voltage not a lot but hey it s a lemon as i recall we had to hook something like ten of these things to get an appreciable amount of current because of the mondo internal resistance but if you just need a demo you might get it to run a tiny fan or something mark s underwood ee student university of kentucky lab assistant boyd hall microlab a tiny little division of uk library microlabs e mail msunde mik uky edu
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re need pinouts for a g dtmf decoder chip in article montc qs a wb netcom com mont netcom com mont pierce writes i bought this chip from suncoast technology and tried to build their dtmf decoder circuit but it s not working if anyone has the pinouts and possibly the voltage specs i d sure appreciated it i presume it is the m from teltone corporation pin description input input gs gain select through use of feed back resistor vref reference voltage output about vdd connect to vss connect to vss osc clock input osc clock output connect crystal across pins and vss oe output enable logic high allows data output q data output q data output q data output q data output std delayed steering output any other company would call this data valid est early steering output sort of like i m starting to hear a tone st gt steering input guard time output vdd power supply v min v max current ma typ ma max but you really should have bought the motorola part from me i still have them in stock john if someone could fax email or snail mail a copy of the spec sheet for this chip that would be even better please email me if you can help thanks in advance mont pierce ham call km wt internet mont netcom com bands ibm vnet mont vnet ibm com modes cw ssb fm
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pattern generator wanted i repair a lot of monitors here and i d like to know where i can get a pattern generator or a circuit for one that will provide mda ega and vga signals using a whole pc to do this takes up too much space on my bench and is somewhat less than portable i guess i could sit down and design something but i don t have the time right now any reasonable suggestions would be appreciated tnx tg tony grimwood zl ttg make no friendship with an elephant biomedical engineering services keeper unless you have room to university of auckland entertain an elephant auckland new zealand saadi of shiraz
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fm transmitter can anyone please email a diagram or give me details of an ftp site where there is a diagram of a simple small fm mono voice transmitter for trasnmitting in the range preferably above mhz only a short distance requiered and frequency variation no too important but must run from v or smaller dc supply thanx in advance monty howeg uk ac man cs howeg cs man ac uk save the vinyl
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re suggestions on audio relays in article c qsbf iek ms uky edu billq ms uky edu billy quinn writes i built a little project using the radio shack vdc relays to switch audio i got pretty bad clicks when the thing switched i was doing most of the common things one is supposed to do when using relays and nothing seemed to get rid of the clicks my question is is there a good relay relay circuit that i can use for switching audio so that there will be no noise of any kind on the audio lines i will appreciate any advice or references to advice also exact part numbers company names etc for the relays will help are you switching high level signals or low level signals like pre amp out level signals also are the clicks you mentioning the big clack that happens when it switches or are you refering to contact bounce how are you driving the relays ttl gate output switching transistor how are the relays connected to what you are driving need more specifics to answer your question
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specs on eprom data formats i need the specs on various eprom data formats such as intel hex motorola s jedec etc can anyone out there provide such info or a pointer to it the one i want the most is intel hex mike
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wanted tcm chips small quantities does anyone know if a source for the tcm modem chips as used in the baycom and my pmp modems ideally something that is geared toward hobbyists small quantity mail order etc for years we ve been buying them from a distributor marshall by the hundreds for pmp kits but orders have dropped to the point where we can no longer afford to offer this service and all of the distributors i ve checked have some crazy minimum order or so i d like to find a source for those still interested in building pmp kits any suggestions andrew c payne dec cambridge research lab
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re radar detector detectors brian day bday lambda msfc nasa gov wrote on december it was illegal to operate a radar detector in the state of virginia if one got caught one got fined ask me how i know the federal communications act of made it legal for you to operate a radio receiver of any kind on any frequency including x k and ka bands in the united states the electronic communications privacy act of restricted the fca of by making it illegal to receive the land mobile telephone service including i believe cellular phones no restriction was placed on receiving radar or curiously cordless phones enforcement of the virginia law is in violation of the fca of if you have lots of time and money and a lawyer which i m not you can argue this in a federal court and try to have the law overturned i can hardly wait to see the responses to this one but somebody had to say it lockheed sanders may disagree so these are solely the opinions of scott l babb babb rapnet sanders lockheed com we didn t inherit the earth from our parents we are borrowing it from our children
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building a uv flashlight yes i know it sounds crazy call it an urge call it what you want just don t ask why anyway i d like to build a uv flashlight cheaply flashlight means it should be reasonably portable but could have a power pack if necessary my main question is the bulb where can i get uv bulbs do they need a lot of power etc etc i m not too concerned with whether it s long wave or short wave but hey if anyone has a cheap source of bulbs i ll take both one other thing a friend of mine mentioned something about near uv light being cheaper to get at than actual uv light does anyone know what he was referring to thanks much john hawkinson jhawk panix com
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circuit cellar ink address is cci still published if so does anyone have their address
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re radar detector detectors in article apr rapnet sanders lockheed com babb rapnet sanders lockheed com scott babb writes the federal communications act of made it legal for you to operate a radio receiver of any kind on any frequency including x k and ka bands in the united states the electronic communications privacy act of restricted the fca of by making it illegal to receive the land mobile telephone service including i believe cellular phones illegal to receive land mobile telephone service don t you have to have a mobile reciever to even have land mobile telephone service what about ship to shore telephone service no restriction was placed on receiving radar or curiously cordless phones enforcement of the virginia law is in violation of the fca of isin t there some kind of rule regulation law whatever in some juristictions that prohibit the use of police band recievers in vehicles and that radar transmissions are included in the police band so they get covered by the same regulation
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references i ve got the same problem i can t dig up any info on the jumper settings on the hd drives can anyone recommend a reference book s on the subject rather than a quick fix type answer i was going to start hooking up things and logging the results but the prospect of a ten second smoke test deters me thanks kirk cowen via dlg pro v
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re motorola xc rc and rc in article c qwv bz zoo toronto edu henry zoo toronto edu henry spencer writes in article sgberg xu charon bloomington in us sgberg charon bloomington in us stefan berg writes i don t know why my fpu has an xc my original mhz fpu was label mc but it seems to work fine on my system p s or does it mean experimental chip instead of motorola chip the rule for the designations is that if it says mc that means it works exactly the way the datasheet book specifies if it says xc that means there is at least one known bug often these bugs are small and obscure you might never run into them in practice xc units are often pre production sample devices those are normally distributed for evaluation as freebies and are not guaranteed to meet every spec at least motorola admits it unlike certain other companies yep that s for sure that s one thing i like most about motorola aaron
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re microcontroller in article apr lambda msfc nasa gov bday lambda msfc nasa gov brian day writes mcole spock cole writes i would like to experiment with the intel family does anyone out there know of any good ftp sites that might have compiliers assemblers etc try lyman pppl gov pub great this site is a complete shadow of the signetics bbs directory thanks brian mont pierce ham call km wt internet mont netcom com bands ibm vnet mont vnet ibm com modes cw ssb fm
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re exploding tv just a thought maybe it possibly has to do with the fact that it is an emerson i ve got an emerson vcr which is in the series returned it six times for various and never the same problems got tired of taking it back and fixed it myself the hi fi window was a bit off something like the hi fi audio fine tuning when i was a wal mart associate in we had at least one returned as defective every single day how s that for reliability face it emerson can make audio stuff albeit not of premium quality but they can t make anything as complex as video equipment with reliability imho please no flames just had to share my emerson disaster in the light of this exploding tv jc la vie c est une plage caffine not present error jmc engr uark edu this message printed on abort retry fail recycled electricity tangerine
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re need to find out number to a phone line joseph mich krzeszewsk writes msg id quomg f m bigboote wpi edu posted apr gmt org worcester polytechnic institute well this is my second try at posting on this subject here goes in texas corpus christi at least if you pick up the phone and dial the phone company will read the number of the phone you are on back to you i believe the service department uses this to make certain they are repairing the correct lines when they open the big junction boxes i don t know if it will work but you can give it a try good luck where i live i use bctel the number to dial is for the same result sean oliver internet address a mindlink bc ca mindlink bbs
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mhz oscilloscope for sale i m giving up hardware design and am selling my oscilloscope bk precision model b mhz dual trace barely used firm fry s sells it for tax prefer people in silicon valley so i don t have to ship it mtrek netcom com
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info nec ab amp ic w amp secs possible pspice models hi being a electronic engineering student with only electronic ii under my belt i find myself needing to build a moderate wattage audio amp so i ll throw out a couple of question for the vast knowledge of the net please explain how watts are calculated in audio amp circuits no not p i e just how it relates to one of the following ai current gain av voltage gain ap power gain or whatever i already have a wonderful cheap i e schematic for a w amp but i would like to cross improve the circuit the problem is that the parts list has ic and ic as nec ab amplifiers they look like pin sip packages with a heatsink this schematic was published in a mag so it may be non existant now anyway i tried looking up a replacement in the latest digi key cat and found it not listed the closes i could figure was a pin sip as tda bu anyone got any ideas i thought hey i can rin a pspice simulation using opamp models yea great it worked but i guess the wasn t made for high power amps as a result i got a voltage gain of mv v worse than i started with does anyone have a pspice ckt file with cheap yet good gain how about some models for some of the chips listed in this e mail any ascii chip info you guys can send me i m open to suggestions ideas comments help please e mail since i have little time to search the news and i ll post if there s and interest john ibm ee majors do it best atari john d zitterkopf rules jdz ra msstate edu jdz msstate bitnet aol zitt aol com jdz isis msstate edu
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re radar detector detectors in article apr julian uwo ca wlsmith valve heart rri uwo ca wayne smith writes no restriction was placed on receiving radar or curiously cordless phones enforcement of the virginia law is in violation of the fca of isin t there some kind of rule regulation law whatever in some juristictions that prohibit the use of police band recievers in vehicles and that radar transmissions are included in the police band so they get covered by the same regulation those rules regulations laws would be subject to the same attack that they are attempting to preempt federal authority to regulate or not radio communications of course as the original poster noted court challenges of this kind can get expensive all work is one man s work henry spencer u of toronto zoology kipling henry zoo toronto edu utzoo henry
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re power signal surges in home gstovall crchh nosubdomain nodomain greg stovall writes anyway over the weekend i was resting on the sofa in between chores and noticed that i briefly picked up what sounded like ham radio traffic over my stereo and television even though both were off also all the touch sensitive lights in my house start going wacko cycling through their four brightness states i presume that some ham operator with an illegal amplifier drove past my house i live on a busy thoroughfare would this be a correct presumption what kind of power must he be putting out to cause the effects the affected equipment is about feet from the road hams can legally run up to watts it is very unlikely however that a ham would be running that kind of power from a car ham rigs for cars put out around watts it is possible that a watt radio would cause interference to consumer electronic feet away most tvs stereos and vcrs have very poor rf shielding if you experience the problem frequently it may be caused by a ham cber or other radio operator in a base station nearby the interference may have been caused by a radio transmitter used for other purposes such as police fire etc if you heard voices over your stereo i think you are correct in assuming that the source is an rf transmitter if you have frequent trouble you may want to try the rf ferrite chokes available at radio shack the interference is probably being picked up by your speaker wires and those chokes can be installed on the wires very easily without cutting them good instructions are included with the chokes if that does not solve the problem you may want to search your neighborhood for a radio operator look for antennas on the roof or car talk to him her about your problem there are things a radio operator can do to reduce interference randall rhea informix software inc project manager mis sales marketing systems uunet pyramid infmx randall
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how can uf be different from two in series i was looking at the amps diagram for sony receivers and i was amazed to find a difference between the us and canadian model on the capacitor s that hangs off the output to the speakers to speaker identical both models from amp idnetical both models canadian model only us model and world wide model only candian model only gound the board itself is also identical with room for all three caps the us can versions is clearly indicated in both places how does that make sense is essentially for caps there are just standard caps no special w type precision please explain this michael golan mg cs princeton edu
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need help finding dip switch settings and jumper settings for sx motherboard hello net i have a sx motherboard with the phoenix bios an on board ide controller port and two on board serial ports unfortunately i don t have a manual for this beast and i would like to be able to disable the ide controller in order to use the mfm controller i have the board says it is made in korea and it uses the chips chipset if anyone can give me a clue as to how to go about configuring the board so as not to use the ide controller or how to go about finding out how to do it their help would be greatly appreciated thank you in advance for your assistance please mail buhrow nfbcal org with your responses as my news feed is rather tenuous thank you very much brian buhrow nfbcal org
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needed volt circuit flasher i am looking for a source for a circuit sequence flasher input volts ac amps output sequence to channels knob to vary frequency max amps per leg switch to put all channels on full time please email any assistance you can provide randy email randy ve bc ampr ab ca randy j pointkoski p eng o compression technologies ave
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help mc a real time clock standby mode i am having trouble obtaining the specified standby current drain from a mc a real time clock has anyone out there had some experience in doing this the specs call for a few sequences to be met before standby mode is activated and are a bit hard to decipher on that but i thought that i had it worked out however with a khz crystal the lowest current drain i can acheive at v vcc is ua this is three times the specified maximum under the conditions i am attempting to create i have done the following things made sure that reset is asserted for trlh after powerup and as is low during this time made sure that there is a cycle on as after the negation of rd or wr during which stby was asserted what am i doing wrong thanks very much martin
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help wanted could someone please tell me if a decoder is the same as a to demultiplexer i know how to link of these to get an output circuit but how do i link of these to make a multiplexer sorry if this seems like a lame question but i m only a newbie to electronics and i have to do this circuit please make any mail as droolproof as possible thanx taro ogawa u student canberra edu au
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re dmm advice needed what the world needs is a meter that won t let you change ranges or turn it on off with a lead stuck in the amps jack a little bit of clever plastic detailing would take care of this and make the world safer for electricans anyway not that i ve ever put a meter on the wrong range into a live circuit no not me not more than a dozen times anyway bill bills inqmind bison mb ca the inquiring mind bbs winnipeg manitoba the fluke beeps at you if you try to take it out of a current measuring range while there is still a lead plugged in to the current sense socket this should solve your problem unless you are in a noisy environment johnh electronics department school of mpce macquarie university sydney australia email johnh mpce mq edu au ph fax
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re fujitsu hdd the fujitsu uses what is known as an smd interface storage module device a lot of older minis used it sun still does on their server models there are several different speeds of smd and i think that the fuji drive you have is rated at about mb sec thats megabits there used to be several companies that made couplers for the pc interphase in texas being one but i think that the market pretty much has dried up controllers for this type of drive are readily available for vme buses though rumor has it that there is a smd to scsi adapter available but i think that it was designed for slower smd devices in other words if you have a pc or mac that drive is pretty much dogmeat cheers corwin
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pwm control thru software currently i am using the microcontroller with external eprom in order to drive the dc motor with direction i use the pulse width modultion thru software control assembly language programming however i am afraid that they will be overheads and thus alter the pulse timing my question is is the software pwm control reliable i understand that port is a latch and so i vary the duty cycle by setting it high first and at the desire duty cycle then i set low any improments
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re looking for electronics dept info in austrailia in apr worak kaist ac kr hjkim hyowon pusan ac kr writes hi netters i am looking for the list of universities in austrailia which has electronics department i am considering to spend a year for research in austrailia about communication area i am interested in mobile communication areas and spread spectrum communications etc but i don t have any information about austrailian universities can anybody recommend a good university in co mmunic ation area any comments will be welcomed bye jaehyung kim well i honestly don t know if they are good bad or indifferent but there is an electronics dept here at la trobe la trobe university bundoora vic australia fax chairman is prof ian white sorry don t have an email address graham b
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hatley pirbhai help hello has anyone used the requirements analsys methodology hatley pirbhai i am a british final year real time degree student and as a project i am covering this methodology i would be very grateful to anyone who could give me their views on this method please mail me if you feel you can help and i will send you my questions thanks in advance david phelps nwz h chelt ac uk
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oem weight scale does someone sell oem scale units with either analog or digital output i need something like the scales used in supermarket cash registers with a dynamic range of a few pounds and reasonable accuracy any sources david david prutchi hc dt washington university prutchi mesun wustl edu campus box dp cec wustl edu one brookings drive prutchi eng tau ac il st louis mo
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digital answering mach does anybody know anything about the chips d a d a d a chips from dsp telecommunications inc i d greatly appreciate information about price pinouts and peripherals regards henrik bohre
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re need to find out number to a phone since i have seen various different numbers to dial to get your number read back to you by the phone company could someonepost a list or point me to a book where i could get a list of all the different numbers for the u s failing that could someone tell me ohio s i don t speak for wright mvanhorn desire wright edu state i just give them wright state university huge amounts of money
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re need to find out number to a phone line in article bd dea ecs umass edu alee ecs umass edu writes greetings situation i have a phone jack mounted on a wall i don t know the number of the line and i don t want to call up the operator to place a trace on it question is there a certain device out there that i can use to find out the number to the line thanks for any response al do you get a dial tone when you plug a phone into the jack if not then the line is possibly disconnected from the nearest telco junction box if you do get a dial tone then surely the telco is sending a bill for the line to someplace or somebody are you sure that what you are doing is on the level sounds to me like you are just trying to get at somebody s unlisted number fess up keith keith boyd ncr mcpd cola nothing could be finer than huntin and platt springs rd and fishin in south carolina me west cola s c go gamecocks keith boyd columbiasc ncr com vp or from uunet uunet ncrcom ncrcae clodii keith
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re rams roms with ale latches for s in article qg sinnokf sheoak ucnv edu au j pethybridge jeff redgum ucnv edu au writes i asked this a year ago but i am still looking i am getting sick of having to use a hc or a check out xicor s new goodie in the april th edition of eetimes x c an k e prom with built in latch and bootloader setup you hook it directly to your power it up the prom initialises the serial port on the you load in your code via rxd this gets blatted onto the e prom then you reset and run i m sure dallas also does something like this too i suppose it would boil down to relative prices and the dallas part freeing up p p completely i wonder if anyone has ever managed to design a single sided pcb with an eprom sram and no links cheers mike
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homemade projector automation hi all i m an assistant manager at a local art theater here in columbus i d like to expand our show automation a bit namely add the capability to use cue tapes to bring the houselights up our current automation consoles date from the early s and don t provide this function we already have the combo failsafe contact rollers to read the cuetapes and our dimmer system will raise the houselights when its fade up control circuit vac is momentarily closed for at least second i ve tried wiring the dimmer control to a v relay activated when the cue tape completes the circuit low tech and simple but there s one problem in order to get the second pulse there needs to be a sh load of cuetape on the film mm runs at feet per minute so to get a second pulse there needs to be at least inches of solid cuetape ideally i would like to use a single cross cue to accomplish this function a single strip of cuetape perpendicular to the length of the film this would give a pulse of approximately of a second what i need is a circuit to detect the short cue and activate the relay for around second the ability to adjust how long the relay is activated would be nice i figure this would require an rc circuit of some sort i m sure some of you already have the solution figured out in your heads any suggestions and schematics would be appreciated thanks mark fontana of all the arts the cinema is mark a fontana the most important computer and information science v i lenin the ohio state university
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sci.electronics
re cicuit cellar ink extras trade in article babb larc sdsu edu babb sciences sdsu edu j babb writes fellow info junkies i have an extra cci real time programming embedded sensors storage and an extra cci voice control of telescope among other articles no labels no torn cut up or missing pages would like to trade for cci or cci or cci in same condition labels ok i mail mine you mail yours mutual trust kinda thang ok you don t actually throw them away do you thanx jeff babb babb sciences sdsu edu i have also been trying to complete my collection i have an extra cci communications and a applications in the arts both in mint condition i would like to trade for or buy the following and thanks david david prutchi hc dt washington university prutchi mesun wustl edu campus box dp cec wustl edu one brookings drive st louis mo
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sci.electronics
decent cheap mhz scopes any info on modern mhz or better dual trace scopes would be appreciated should i buy a used one or a new one and where please e mail thanks in advance ken ken gravenstede performance technologies incorporated kng pt com science parkway rochester new york uupsi ptsys kng
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sci.electronics
re food dehydrators does anybody out there have one of those food dehydrators i ve been seeing all over late night tv recently i was wondering if they use forced air heat or both if there s heat involved anybody know what temperature they run at my wife would like one and i m not inclined to pay for a box a fan and a heater seems to me you should be able to throw a dehydrator together for just a few bucks heck the technology is only what years old yeah but years ago you couldn t buy it from a guy with sprayed on hair
7,390
sci.electronics
re how can uf be different from two in series in apr princeton edu mg cs princeton edu michael golan writes i was looking at the amps diagram for sony receivers and i was amazed to find a difference between the us and canadian model on the capacitor s that hangs off the output to the speakers to speaker identical both models from amp idnetical both models canadian model only us model and world wide model only candian model only gound the board itself is also identical with room for all three caps the us can versions is clearly indicated in both places how does that make sense is essentially for caps there are just standard caps no special w type precision please explain this michael golan mg cs princeton edu the only explanation i can think of is that two capacitors in series can handle twice the output voltage sometimes two elco s in antiseries you know positive sides facing eachother are used to obtain a large capacitor that can handle positive and negative voltages as well so there probably is no design philosophical reason but a production cost one best s wouter
7,391
sci.electronics
hc public domain software does anyone know of an ftp site where i might find public domain software for the motorola hc microprocessor i am looking for a basic interpreter compilier or a c compiler thanks in advance ed murashie ed murashie us mail beckman instruments inc phone diagnostic system group fax s kraemer blvd w internet murashiea mail beckman com brea ca
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sci.electronics
realistic pro scanner for sale was sell for article of alt radio scanner path usenet ins cwru edu cleveland freenet edu aj from aj cleveland freenet edu aaron m barnes newsgroups alt radio scanner subject realistic pro for sale was sell for obo date apr gmt organization case western reserve university cleveland ohio usa lines message id r oo du usenet ins cwru edu nntp posting host slc ins cwru edu hello i have a realistic pro scanner for sale here is a small desc ription programible chanels fully detailed backlighted digital display headphone jack antenna jack removable telescoping antenna auto search coverage mhz mhz mhz it originally cost but i will sell for thank you buchanan in fear the goverment that fears your guns without the nd amendment we cannot guarantee ou r freedoms aj cleveland freenet edu buchanan in fear the goverment that fears your guns without the nd amendment we cannot guarantee ou r freedoms aj cleveland freenet edu
7,393
sci.electronics
adcom gtp ii ir sensor repeater spec s does anyone know the details of the interface wire din for the ir remote sensor wire ir repeater for the adcom gtp ii preamp the adcom part numbers are the xr ii spm ii and ira ii a cursory physical examination of the pre amp connector indicates that the connector pin din may provide viewed from connector front pin v ma pin v ma pin signal ground pin demodulated signal v pp polarity ma drive pin signal to drive repeater led drives through ohm resistor v pp i assume that the repeater connectors mini plugs drive the ir repeater led s directly true can anyone fill in the s thanks john rasper hewlett packard col johnr col hp com p o box colorado springs co
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sci.electronics
re what is zero db marrevola rediris es wrote in article apr bnr ca moffatt bnr ca john thomson writes joseph chiu josephc cco caltech edu wrote and the measure of current amp is actually named after both the amp company and the amphenol company both companies revolutionized electronics by simulatenously realizing that the performance of connectors and sockets were affected by the amount of current running through the wires sorry the unit for current is the ampere which is the name of a french man named ampere who studied electrical current the term amp is just an abbreviation of it the company amp came after the ampere unit was already in use the ohmite company was the first to characterize resistances by numbers thus our use of the ohms i don t know about this one but it doesn t sound right are you two joking is the entire internet flaming you two ahh now i remember that ohmite company was the first introducing the pink colored resistor only for electronics working females manuel arrevola velasco true e mail manolo taf fundesco es dod yes i have taken a bit of flame on this one i must ve been half asleep when i posted a response to joseph greggo greg moffatt moffatt bnr ca bell northern research inc ottawa canada my opinions not bnr s
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sci.electronics
re radar detector detectors in article apr julian uwo ca wlsmith valve heart rri uwo ca wayne smith writes in article apr rapnet sanders lockheed com babb rapnet sanders lockheed com scott babb writes no restriction was placed on receiving radar or curiously cordless phones enforcement of the virginia law is in violation of the fca of isin t there some kind of rule regulation law whatever in some juristictions that prohibit the use of police band recievers in vehicles and that radar transmissions are included in the police band so they get covered by the same regulation what do you mean by police band there is no such thing anyway radar detectors work in shared bands if you applied your test all of those radar operated door openers in malls would be illegal one of the great problems here is that there are too many ill educated read illiterate people making too many laws about subjects on which they are incompetent there may well be laws refereing to police bands they are almost certainly local in scope state or county created by well meaning but incompetent idiots unfortunaltely laws do not have to be sensible or even enforceable lawmakers exist to pass laws and will continue to do so until the day where you are faced with death for not doing x and amputation of all your limbs for doing x the choice will be yours note no smiley philip
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sci.electronics
los angeles freeway traffic reports while driving through the middle of nowhere i picked up knbr am a clear channel station based in los angeles they had an ad claiming that they were able to get traffic flow information from all of the thousands of traffic sensors that caltrans has placed under the pavement does caltrans sell this info does knbr have an exclusive what s the deal doug former l a commuter claar
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sci.electronics
re suggestions on audio relays in article c r r id megatest com alung megatest com aaron lung writes in article c qsbf iek ms uky edu billq ms uky edu billy quinn writes i built a little project using the radio shack vdc relays to switch audio i got pretty bad clicks when the thing switched i was doing most of the common things one is supposed to do when using relays and nothing seemed to get rid of the clicks my question is is there a good relay relay circuit that i can use for switching audio so that there will be no noise of any kind on the audio lines i will appreciate any advice or references to advice also exact part numbers company names etc for the relays will help are you switching high level signals or low level signals like pre amp out level signals also are the clicks you mentioning the big clack that happens when it switches or are you refering to contact bounce how are you driving the relays ttl gate output switching transistor how are the relays connected to what you are driving need more specifics to answer your question as a general rule no relay will cleanly switch audio if you try to tranfer the circuit with the contacts the noise you hear is due to the momentary opening and closing of the path the noiseless way of transfering audio is to ground the circuit in high impedance audio circuits a resistive t is constructed close to characteristic impedance of the circuit grounding the imputs connected to the t transfers the audio in low impedance circuits transformers are usually used and the inputs are shorted out or grounded secondaries are paralleled at the characteristic impedance sometimes if it is necessary to actually switch audio a second contact is used to momentarily short the circuit output for the duration of the switching time telephone relays are handy because contacts can be adjusted to make before break and vica versa but i haven t seen any of these for years nowadys switching is done electronically with op amps etc a novel circuit i used to build was a primitive optical isolator it consists of a resistive photocell and a lamp all packaged in a tube when the lamp is off the cell is high resistance turn the lamp on and the resistance lowers passing the audio once again this device in a t switches the audio varying the lamp resistance give a remote volume control use variable resisters and you have a mixer lots of luck tom tom wagner audio visual technician malaspina college nanaimo british columbia loc fax callsign ve gda weapon kentucky rifle snail mail to site q c rr nanaimo british columbia canada v r x i do not recyle i keep everything all standard disclaimers apply
7,398
sci.electronics
correction of last followup re relays in article apr mala bc ca wagner mala bc ca tom wagner wizzard of old audio visual equipment nanaimo campus writes in article c r r id megatest com alung megatest com aaron lung writes in article c qsbf iek ms uky edu billq ms uky edu billy quinn writes i built a little project using the radio shack vdc relays to switch audio i got pretty bad clicks when the thing switched i was doing most of the common things one is supposed to do when using relays and nothing seemed to get rid of the clicks my question is is there a good relay relay circuit that i can use for switching audio so that there will be no noise of any kind on the audio lines i will appreciate any advice or references to advice also exact part numbers company names etc for the relays will help are you switching high level signals or low level signals like pre amp out level signals also are the clicks you mentioning the big clack that happens when it switches or are you refering to contact bounce how are you driving the relays ttl gate output switching transistor how are the relays connected to what you are driving need more specifics to answer your question as a general rule no relay will cleanly switch audio if you try to tranfer the circuit with the contacts the noise you hear is due to the momentary opening and closing of the path the noiseless way of transfering audio is to ground the circuit in high impedance audio circuits a resistive t is constructed close to characteristic impedance of the circuit grounding the imputs connected to the t transfers the audio in low impedance circuits transformers are usually used and the inputs are shorted out or grounded secondaries are paralleled at the characteristic impedance sometimes if it is necessary to actually switch audio a second contact is used to momentarily short the circuit output for the duration of the switching time telephone relays are handy because contacts can be adjusted to make before break and vica versa but i haven t seen any of these for years nowadys switching is done electronically with op amps etc a novel circuit i used to build was a primitive optical isolator it consists of a resistive photocell and a lamp all packaged in a tube when the lamp is off the cell is high resistance turn the lamp on and the resistance lowers passing the audio once again this device in a t switches the audio varying the lamp resistance give a remote volume control use variable resisters and you have a mixer lots of luck tom tom wagner audio visual technician malaspina college nanaimo british columbia loc fax callsign ve gda weapon kentucky rifle snail mail to site q c rr nanaimo british columbia canada v r x i do not recyle i keep everything all standard disclaimers apply tom tom wagner audio visual technician malaspina college nanaimo british columbia loc fax callsign ve gda weapon kentucky rifle snail mail to site q c rr nanaimo british columbia canada v r x i do not recyle i keep everything all standard disclaimers apply
7,399
sci.electronics
correction re audio relay followup gremilins have attacked my keyboard and the correction to my followup on audio relays got fouled up varying lamp resistance should read varying lamp voltage tom tom wagner audio visual technician malaspina college nanaimo british columbia loc fax callsign ve gda weapon kentucky rifle snail mail to site q c rr nanaimo british columbia canada v r x i do not recyle i keep everything all standard disclaimers apply