04/13/2017 at 22:25 •
The Cable Tester v1.0 had some serious issues. That tester could detect non-connected cables/lines but it had problems recognizing miss-connected / switched cables. So I have made a plan for the newer version with the help of @davedarko's comment.
Check out and test online the new circuit: https://circuits.io/circuits/4643590
The new circuit needs a new box as well. But that is for another time.
04/06/2017 at 20:27 •
The very fist version of the cable tester is very simple: four switches with four LEDs. When the cable connected you can switch on/off the buttons and the LEDs bright up if the line has connection. That seems simple and perfect. But ...
And the final and working product:
So it works just fine. When I connect the XLR cable I can check to connectivity of the 3 main lines/pins and the chassis ground.
But what does this circuit do when some cables are connected but in a wrong way? Sometimes it works just fine (left picture), but in other cases it makes false OK signs (right picture). So it is time to make a better version of the circuit.