Cable Tester

Discussion in 'The Projects Forum' started by deegan, Apr 8, 2014.

  1. deegan

    Thread Starter New Member

    Nov 18, 2013
    Hey Everyone,

    Im making an RJ45 cable tester to check that its been wired up correctly. I'm using a 555 timer and a 4017 counter circuit with rj cable connected across the counter outputs with LED's. If the LED's light up in order then they are fine. I was looking at trying to add a buzzer if it goes wrong and possible sequence checker. Wonder if anyone had any suggestion on best way to do this???
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    An exclusive OR gate from a wire input to output would detect errors on your set-up.

    You then combine the outputs (probably an OR gate) to drive the buzzer.
  3. JohnInTX


    Jun 26, 2012
    The little commercial RJ45 tester I have has 2 pin bi-color LEDs to detect interchanged wires in a pair. Green=OK, Red=Backwards. I don't know if its a doable addition for your circuit but thought I'd throw it out there.