Cd4511 troubleshoot

Discussion in 'The Projects Forum' started by ryajhi, Mar 2, 2013.

  1. ryajhi

    Thread Starter New Member

    Feb 28, 2013
    5
    0
    I am currently building a counter ic clock. On the minutes display the decoder displays numbers 1,2,3,0,1,2,3,8,9,0 in that order repeatedly. I'm certain that all the chip is working by replacing it with a new one. Any help will be appreciated.
     
  2. ScottWang

    Moderator

    Aug 23, 2012
    4,853
    767
    You should check your wiring and attach the circuit.
     
  3. Meixner

    Member

    Sep 26, 2011
    116
    21
    You are missing the 3rd input bit (pin 2 on the 4511)
     
  4. ryajhi

    Thread Starter New Member

    Feb 28, 2013
    5
    0
    thank you so much! looks like i shorted q3 to ground by accident. thank you very much.
     
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