I need to check the integrity of 40+ custom cables. Each cable is meant to be the same, and is meant to have 19 ways.
I bought an enclosure, some mating connectors, some LEDS and a bunch of resistors and diodes. My first and second attempts at building tester circuits were unable to catch the three conditions I want to check for:
- short circuits
- open connections
- cross wiring
So now I'm back at the computer. I have searched the internet, and I have found a CAT5 tester circuit here.
I recreated part of this circuit using the awesome tool at Falstad,
Here is the result:
Only when each adjacent LED pair lights when the switch is flipped, can the cable be considered good.
I’m somewhat confident I can extend the circuit so that it can test each way in my cable, but can anyone offer improvements or advice before I start my third implementation? I have a nagging suspicion I am overlooking something, or there might be a really simple way to do this!