Multisim and BCD Display issue

  • Thread starter dbeckfor
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  • #1
dbeckfor
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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.
 

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  • #2
berkeman
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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.

What do you see when you monitor the currents in various parts of the LED drive circuit?
 
  • #3
dbeckfor
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What do you see when you monitor the currents in various parts of the LED drive circuit?

I get 3.32 pA and 3.32 mV
 
  • #4
berkeman
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I get 3.32 pA and 3.32 mV

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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