Digital Alarm Clock in Multisim. (Home Work/ Final)
In the end. I needed to tie the equal too pin high on the first comparator in order for any of the comparators to work. Reading through the data sheet, I am not sure how I would have found that information. (Thank you Chris Stratton for suggesting to start small.) As for the ghost pico volts, I am still unsure. I originally used two pole switches so that I could tie the pin high or low. (I again can not use pull down resistors due to component restraints.) All signals were tied together as were all grounds. I initially thought this is were the noise was coming from somehow. I deleted all grounds but left the double pole switches. The 5 pico volts disappeared but 5 volts appeared on the empty latch. If memory serves correctly, fundamentals of DC Circuits would explain that. (Potential). However, My A pins read 0 volts meaning they were not equal to the 5 volt potential. Now the ever loving confusing part to me. I switched the switches for single pole and the problem disappeared. Circuit worked the first try. So my newest confusion. Why did it matter? I thought components in simulations were to be ideal. I cannot fathom how changing from a two pole with only one pole used to a single pole worked, or where the five pico volts came from in the first scenario. Thank you for the help. This is my major, any suggestions to personal simulation software would be greatly appreciated. Also, scrolling through a built schematic for diagnostics is not so bad. Scrolling through a schematic while designing, not so fun. Any one use like a TV for circuit design or am I doomed the nature of the beast?