Why Won't My 7 Segment BCD Display Light Up in Multisim?

  • Thread starter Thread starter dbeckfor
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Discussion Overview

The discussion revolves around troubleshooting a 7 segment BCD display that is not lighting up in Multisim. Participants are exploring the use of the 74LS48N Decoder with a Common Cathode 7 Segment Display, focusing on the electrical characteristics and signal integrity within the circuit.

Discussion Character

  • Technical explanation, Debate/contested, Experimental/applied

Main Points Raised

  • One participant expresses difficulty in getting the 7 segment BCD display to turn on in Multisim, mentioning the components used.
  • Another participant suggests monitoring the currents in various parts of the LED drive circuit to diagnose the issue.
  • A participant reports measuring 3.32 pA and 3.32 mV, indicating low current and voltage levels.
  • Another participant comments that the measured picoamperes will not be sufficient to light an LED and questions whether the signals going into the LED driver are correct.
  • There is a suggestion to trace the signals using a simulator or oscilloscope to better understand the circuit behavior.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the cause of the issue, with multiple viewpoints on the measurements and troubleshooting steps remaining unresolved.

Contextual Notes

Participants have not provided details on the specific connections or configurations used in the circuit, which may be relevant to the troubleshooting process.

Who May Find This Useful

Individuals working with digital circuits, particularly those involving BCD displays and LED drivers in simulation environments.

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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dbeckfor said:
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?
 
berkeman said:
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
 
dbeckfor said:
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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