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Strange voltage from 74ls02 nor gate

Discussion in 'General Electronics Discussion' started by Eerik1111, Mar 26, 2014.

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  1. Eerik1111

    Eerik1111

    7
    0
    Mar 26, 2014
    im working on a seven segment display that is going to display numbers In a 3 switch sequence (meaning 8 different positions) and I ran into a problem with an IC, or so I think it is the IC. I changed the IC to see if it was bad but I got the same problem I have attached a photo (missfigures6) that gives an better explaination of the situation If you want, (and have multisim 13) I can send you the multisim file via email. just post your email bellow and I can give it to you if anyone has any suggestions that I could try please suggest them. there is also the truth table and drawn schematic
     

    Attached Files:

  2. Arouse1973

    Arouse1973 Adam

    5,164
    1,081
    Dec 18, 2013
    We will need to see your whole circuit and tell us what ABC are set to on the input versus the number your getting. Also U71 is a single output so not sure how this is going to send the right signals to the display. What is the other PCB in your photo doing?
    Adam
     
  3. Eerik1111

    Eerik1111

    7
    0
    Mar 26, 2014
    the diagram is there. you can see for yourself. I am only concerned about the one input. the rest of the circuit is functioning normally. the problem is how I stop the alkward voltage issue. the numbers come through fine. the issue is a voltage alkwardness in the G input circuit. (g meaning the input on a seven segment display common cathode)
     

    Attached Files:

    Last edited: Mar 26, 2014
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