Up counter with 74LS192N and 74LS47 decoder

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pentanol

Joined Dec 29, 2016
3
Hi
I am trying to make an up down counter using 74LS192N and 74LS47 decoder in Multism
This doesent work for the configuration I made. Where is the mistake in the attached picture.
 

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spinnaker

Joined Oct 29, 2009
7,835
Are you going to define the problem you are seeing? Or do you expect people to look at every single possibility of what might be wron?
 

Reloadron

Joined Jan 15, 2015
5,993
You are showing a 50 Hz input frequency. Your display will likely appear as a blur. 50 Hz is .020 second which is sort of fast if you are expecting to see an incremental count on the display. Also your X1 through X4 reflect incandescent lamps which as mentioned, if that is the case the chip won't drive and again, at a 50 Hz rate you will never see them change on or off.

Ron
 

dl324

Joined Mar 30, 2015
12,917
Your display will likely appear as a blur. 50 Hz is .020 second which is sort of fast if you are expecting to see an incremental count on the display.
Multisim won't simulate anywhere near 50 Hz. I've used a fast clock many times to get a reasonable actual frequency...
 

EM Fields

Joined Jun 8, 2016
583
Hi
I am trying to make an up down counter using 74LS192N and 74LS47 decoder in Multism
This doesn't work for the configuration I made. Where is the mistake in the attached picture.
The incandescent lamps loading the counter will load its outputs to the point where the inputs to the 74LS47 will be out of bounds.
 
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