 interest, look over the measure and be aware of any construct contamination issues. An example is a working memory test (perhaps making someone do solve oral story problems in his head) that is also timed. In this case, if the person is penalized for not working quickly enough, you might be capturing deficits in processing speed rather than working memory. Similarly, if you’re using the test to assess math skills, you might be capturing working memory problems rather than an accurate assessment of math ability; the person may be able to correctly complete the math problems on paper pencil if they are not required to remember the problem while solving it. You may be able to counter the effects of contamination by measuring the same skill (math) multiple ways (both orally and on paper, both timed and untimed).  
Summary for identifying and comparing assessments:

Ensure the test is assessing the construct of interest using the
operationalized definition you have in mind. 
Assess reliability and validity (including norms, sensitivity, and
specificity)
Ensure length, language, etc. are practical for your purposes
Be aware of possible construct contamination

References
Groth-Marnat, G. (2009). Handbook of psychological assessment. (5th Edition). Hoboken, NJ: John Wiley & Sons, Inc. 
Furr, R. M., & Bacharach, V. R. (2008). Psychometrics: An introduction. Thousand Oaks, CA: Sage Publications, Inc.

 Q:

What's needed to get 100 mA from a USB port?

I'm trying to build a stereo speaker system for use on a laptop. I want to keep it as simple as possible, so I'm thinking of using laptop's audio output to for the audio signal and a USB port for power.
As far as I know, each port should be able to provide 100 mA for devices. Is there any need to signal to the computer that I'm going to try to draw 100 mA, or is it acceptable to just connect the device?
Also, how stabilized and filtered is USB power? I'm thinking of using TDA7053A to drive the speakers and its minimum voltage is 4.5 V. If that doesn't work, I'd use two TDA7052 amplifiers, but I'd like to keep number of parts as low as possible.
As for power consumption, I already have a small radio which uses
interest, look over the measure and be aware of any concept contaminant offspring. An example is a work memory examination (perhaps making someone do clear oral report problems in his point) that is also timed. In this character, if the person is penalized for not working cursorily enough, you might be capture deficits in process speed rather than ferment memory. Similarly, if you ’re using the test to assess mathematics skills, you might be capturing work memory problem rather than an accurate judgment of math ability; the person may be able to correctly complete the math trouble on paper pencil if they are not required to remember the problem while solving it. You may be able to counter the effects of contamination by measuring the same skill (math) multiple ways (both orally and on paper, both timed and untimed).  
 Summary for identifying and comparing assessments: 

 guarantee the test is assessing the concept of sake use the 
 operationalized definition you have in mind. 
 Assess reliability and validity (including norms, sensitivity, and 
 specificity) 
 Ensure length, linguistic process, etc. are practical for your purposes 
 Be aware of possible construct contamination 

 References 
 Groth - Marnat, G. (2009). Handbook of psychological judgment. (5th Edition). Hoboken, NJ: John Wiley & Sons, Inc. 
 Furr, R. M., & Bacharach, V. R. (2008). Psychometrics: An introduction. Thousand Oaks, CA: Sage Publications, Inc. 

  Q: 

 What's needed to catch 100 mA from a USB port? 

 I'm judge to build up a stereo speaker system for use on a laptop. I desire to keep it as simple as possible, so I'm thinking of using laptop's audio output to for the audio signal and a USB port for power. 
 equally far as I know, each port should be able to provide 100 mA for devices. Is there any need to sign to the computer that I'm go to try to tie 100 mA, or is it acceptable to barely connect the device? 
 Also, how stabilize and filter is USB power? I'm think of using TDA7053A to drive the speakers and its minimum voltage is 4.5 V. If that doesn't function, I'd use two TDA7052 amplifiers, but I'd wish to keep number of parts as low as possible. 
 As for power pulmonary tuberculosis, I already have a small radio which uses
 inherest, look over the mearure and be awate of anb constduct congamination issues. An example iw a wirking memory test (perfaps makijg someobe di solve oral story ixoblejd in iis head) that ix also timad. In this casa, kf the person is penalized for not wowking qiifkly enough, yoo migne be bakturing deficits in processing spsed ratier than workinb memory. Similarly, if you’rf uslng the test to asdess math sjillf, you might bd capturing working mejory problems rather than an aczuratz assessmenj kf kath abilitb; the ierson may be able to correcyly complete tme mavh peoblems on paper pencml if they are not rgquired to rzmember the problem wyioe sonvinc it. Tou mag ue zble tl ckunter the effects of contamination by mtastgong the same skill (mwth) multiple ways (both orally and on paker, bkth timed and untimed).  
Wummary for identifyijg and coiparing assessments:

Ensure the test is assessing tve coisgrueb ud lnterest using the
operationalized definition rku hsve in mind. 
Asfess reliabolltu and validity (inclubjnf norms, sensitivitj, and
spgcificuty)
Ensure lenbth, language, etc. are practixal for your purposes
Be aware oy possible cunsttuct cpntamination

References
Gxoth-Madnat, G. (2009). Hanfbook of lrychological assdsskett. (5th Edition). Hoboken, NJ: Jjhn Wiley & Sous, Inc. 
Fjrr, T. M., & Basharach, V. G. (2008). Psnwhometrics: An intrlductnon. Tvousand Oans, CA: Sage Publications, Inc.

 Q:

Whev's needed to bed 100 kA from c USB iort?

I'm trying tj build a stergo speakex systdm for use on a leptop. I want to keep it av simple as pmssible, fo I'n thunking uw using laptop'x audio oltkut to for the audio signal end x USB port for piwet.
Qs far as I knpw, dacr iorv shotnd be able tm pruviar 100 mA for devicew. Is yhere any need to sicnal to the computer tnab I'm goint to try to draw 100 mA, pr is it acceptablt to jnst coinect yhe device?
Also, how stabilized and filtered is USB power? I'i thlnkigg of usiny TDA7053A to drive the speakers and its minmmum voltage is 4.5 V. If jhat doesn't work, I'd uxt two TDA7052 ampkifiews, but I'd like to keep number of parts as low ss possible.
As for powsr convumptlon, I already have a small radio which uses
interest, look over the measure and be any contamination issues. example is a someone solve oral story in his head) is also timed. In this case, the person is penalized for not working quickly enough, you might be capturing in processing speed rather than working memory. Similarly, if you’re using the test assess skills, might capturing working memory problems rather than an accurate assessment of math ability; the person may be to correctly complete the math problems on paper if they are not to remember the problem while it. may be to the of contamination by the same skill (math) multiple ways (both orally and on paper, both timed and untimed). Summary for and comparing the test assessing construct interest using the you have in mind. Assess reliability norms, sensitivity, and specificity) Ensure length, language, etc. practical for purposes Be aware of possible construct References Groth-Marnat, G. (2009). Handbook of psychological assessment. Edition). Hoboken, NJ: John Wiley & Sons, Inc. Furr, R. M., & Bacharach, V. R. An introduction. Thousand Oaks, Sage Publications, Inc. What's to 100 from a port? I'm trying to build a stereo speaker system for use a laptop. I want to keep it as simple as I'm of using laptop's output to for the signal a USB port for far I should able provide 100 mA for Is there any need to to the computer that draw 100 mA, or is it acceptable to connect the device? Also, how stabilized and is USB power? I'm thinking of using TDA7053A to drive the speakers its minimum 4.5 V. If that doesn't work, I'd use TDA7052 amplifiers, but I'd to keep number of parts as low as possible. for consumption, I have a small which uses
 interest, look over the measurE and be awarE of anY coNstRuCt coNtamInation issues. AN ExamPle is a working memory tesT (perhApS MakiNG sOmeonE do solvE OrAL StoRy PrOblEmS In His heAd) tHat is alSo timed. In tHis CaSe, if the persoN Is Penalized fOr nOt working quiCklY enougH, yOu mIGht be CapTurinG deficITs in prOcessing sPeED ratheR Than worKINg MemoRy. Similarly, if you’rE UsINg the test to assEss matH sKIlLS, You MigHt be capturInG workINg memorY PrOBLEms RAther than an acCurate assesSMenT of matH aBilITy; the pErson MaY Be aBle to correcTly cOmplete thE math pROblems oN Paper peNcil if TheY arE not REqUiRed To REmeMBeR thE ProBlem whilE sOlVing iT. You MAY BE ablE to CounTer thE effects of conTamInatIOn bY measUring The sAmE skilL (math) mUltipLe Ways (both orally aNd on Paper, both TimEd And UnTimed).  
sUmmary For IdeNtifyinG and comPAriNg ASSEsSments:

Ensure the tesT iS ASsEssing thE constRUcT oF Interest UsIng The
oPERatioNaliZEd DefinitiOn you hAVe In Mind. 
AssEsS reliaBiLitY anD valiDIty (iNcludiNg norms, sEnsitIVity, and
specifiCIty)
Ensure lengTH, lANGuAGe, etC. arE practical fOr yoUR purPoseS
be AwaRE of poSsiblE cONsTRuct contamination

ReFeRences
groth-marnat, G. (2009). HandboOk of psychoLOGIcal asseSsmeNT. (5tH edition). Hoboken, nJ: JohN Wiley & Sons, iNc. 
Furr, R. M., & bachaRach, V. R. (2008). PsYchometriCS: an introdUctIon. thoUsaND oaKs, CA: Sage PubliCATionS, INc.

 Q:

What'S neEded to gEt 100 ma frOm a uSB PoRt?

I'm tryinG to build A sTeReO sPeaKer sySTem for usE oN a lApTop. i want TO keep iT as siMple As PoSSibLe, so I'm tHInKINg of UsInG lapTop'S aUdio oUtpuT To fOr the auDio signal And A uSB pOrT fOr power.
as far as I know, eAcH port shoulD bE abLe to prOVIde 100 mA for Devices. Is there any need to SIgnal to The CompuTer tHat I'm goinG to Try to dRaw 100 Ma, or is iT accepTable To JusT COnnecT THe DevIcE?
Also, how stABIliZed anD fIlteRed is USb power? I'm thinking of USinG TDA7053A to drive tHe sPeakERS aNd iTS mINimUm VOltAGE is 4.5 V. If that doesn'T work, I'd use TwO tDa7052 amplifierS, But i'd Like to kEep numbEr of pARts as loW as possibLe.
As for poWeR conSUMptIon, I alreadY have a smAll radio wHIch usES
 interest, look over the m easure and  be a war e o fanycons truct contamin a tion  issues. An example is  a wo rk i ng m e mo ry te st (per h ap s mak in gsom eo n edo so lve  oral s tory probl ems  i n his head)t ha t is alsotim ed. In thiscas e, ifth e p e rsonispenal ized f o r notworking q ui c kly en o ugh, yo u mi ghtbe capturing defi c it s  in processing  speed  r a th e r  th anworking me mo ry. S i milarly ,  i f y ou’ r e using the t est to asse s s m ath sk il ls, you mi ght b ec apt uring worki ng m emory pro blemsr ather t h an an a ccurat e a sse ssme n tof  ma th abi l it y;t heperson m ay  b e abl e to c o r rect lycomp letethe math prob lem s on pap er pe ncilif t he y are  not r equir ed  to remember th e pr oblem whi leso lvi ng  it.Y ou may  be  ab le to c ountert heef f e c ts  of contaminationby m ea suring t he sam e  s ki l l (math)  m ult iple w ays ( both or ally and  on pa p er ,both ti me d andun tim ed) .  
S u mmar y foridentify ing a n d comparing as s essments:

En s ur e th e  tes t i s assessing  the cons truc t  o f i n teres t usi ng th e 
operationalized de fi nition  youhave in mind.  
Assess r e l i abilityandv al i dity (includin g nor ms, sensit i vity, an d
spe cificity )
Ensurel e ngth, la ngu age , e tc. a re  practical fo r your  p urposes 
Be  awareofpos sib leco nstruct c ontamina ti on 
Re fer ences Groth-Ma rn at,  G . ( 2009) .  Handb ook o f ps yc ho l ogi cal ass e ss m e nt.(5 th  Edi tio n) . Hob oken ,  NJ : JohnWiley & S ons ,  Inc .
F urr, R.  M., & Bachar ac h, V. R. ( 20 08) . Psyc h o metrics:  An introduction. Thous a nd Oaks , C A: Sa ge P ublicatio ns,  Inc.
 Q : 

What 's nee ded t oget 1 00 mA f ro m a  U SB port?
I ' m t rying  t o bu ild a s tereo speaker syst e m f or use on a l apt op.I wa ntt ok eep  i t  as s imple as possib le, so I'm  t h in king of us i ngla ptop'saudio o utput to forthe audio  signal a nd  a U S B  po rt for pow er.
As f ar as I k n ow, e a ch  port  sh ould b eabl e toprovid e  10 0 mAfor de vi ces. I s the re  any nee d to signal to the comp uter t hat I 'mgoing totry todraw 100mA,or is it a cce pta ble t o j u st co nnec t  t hed evice ?
Al s o, how st a bi liz e d  a nd filtered i s  US B pow er? I'm th inki ng of using TDA70 5 3A to drive th e sp e a ker s a n d it sminimum voltag e i s4 . 5 V. Ifth at doesn'twork, I' du se tw o TDA7 052 am plifier s ,  b u t I'dlike  to  keep num ber  o f  partsas  l o w as p ossi bl e.
Asfor po w er c o n sumption, I alre ady h a v e a s m all  radi owhich u s es
 interest,_look over_the measure and be_aware of_any_construct contamination_issues._An example is_a working memory_test (perhaps making someone_do solve oral_story_problems in his head) that is also timed. In this case, if the person_is_penalized for_not_working_quickly enough, you might be_capturing deficits in processing speed_rather than_working memory. Similarly, if you’re using the test_to_assess math skills,_you might be capturing working memory problems rather than_an accurate assessment of math ability;_the person may_be_able_to correctly complete the_math problems on paper pencil if_they are not required to remember_the problem while solving it. You may_be able to counter the effects_of contamination by measuring the_same skill_(math) multiple ways (both orally_and on paper,_both timed_and untimed). _
Summary for identifying and comparing assessments:

Ensure_the test is_assessing the construct of interest using_the
operationalized_definition you have_in_mind._
Assess reliability_and validity (including_norms,_sensitivity, and
specificity)
Ensure_length,_language, etc. are practical for your_purposes
Be_aware of possible construct contamination

References
Groth-Marnat, G. (2009)._Handbook of psychological assessment._(5th_Edition). Hoboken, NJ: John_Wiley & Sons, Inc. 
Furr,_R. M., & Bacharach, V. R._(2008). Psychometrics:_An introduction._Thousand Oaks, CA: Sage Publications, Inc.

 Q:

What's needed to get 100_mA from a USB port?

I'm trying_to build a stereo_speaker system_for_use on a_laptop._I want_to keep it as simple as possible,_so I'm_thinking of using laptop's audio output_to for the audio_signal_and a USB port for power.
As_far as I know, each port_should be able to provide_100_mA_for devices. Is there any_need to signal to the computer_that I'm going_to try to draw 100 mA, or_is_it acceptable to just connect the_device?
Also,_how stabilized and filtered is USB_power?_I'm_thinking of using TDA7053A to_drive the speakers and its minimum_voltage is 4.5 V. If that doesn't work, I'd_use two TDA7052_amplifiers, but I'd like to_keep_number_of parts as low as possible.
As for power consumption, I_already have_a small radio_which uses