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Multisim and BCD Display issue

  1. Nov 27, 2009 #1
    I can not figure out how to get my 7 segment BCD display to turn on in Multisim. I am using the 74LS48N Decoder and the Common Cathode 7 Segment Display. I have attached a view for it,its a little messy.
     

    Attached Files:

  2. jcsd
  3. Nov 27, 2009 #2

    berkeman

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    Staff: Mentor

    What do you see when you monitor the currents in various parts of the LED drive circuit?
     
  4. Nov 27, 2009 #3
    I get 3.32 pA and 3.32 mV
     
  5. Nov 27, 2009 #4

    berkeman

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    Staff: Mentor

    Well, pA will not light an LED. Are the signals going into your LED driver correct? That's the advantage of a simulator (or an oscilloscope on a circuit) -- trace the signals out...
     
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