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I want to build a counter circuit which to count from from 0-7, during some pulseswidth. The problem I am having is that it has to do the whole count sequence during one PW and that is where I am struggling to come up with an idea

edit: just want to delete question now, sorrry for irrelevance and being unclear

  • Are shift registers allowed ? And when you say it has to count in one pulse width do you mean that you pulse the clock once and then it starts counting to 7 or every time you need it to count up you pulse once ? – SRR Apr 11 '18 at 14:41
  • Transformers or transistors ? – SRR Apr 11 '18 at 14:46
  • "Or if you may have any links to resources that can explain to me how to do it." One resource: https://electronics.stackexchange.com/questions/9757/t-trigger-minimum-transistor-count – AlmostDone Apr 11 '18 at 14:52
  • How long is the pulse width? – MCG Apr 11 '18 at 15:16
  • Can you use logic gates? Is this a work or school task or something? Only reason I can think of for all the restrictions! – Curious Apr 11 '18 at 15:18
  • look at Sequential Switching Bistable Multivibrator at https://www.electronics-tutorials.ws/waveforms/bistable.html – JIm Dearden Apr 11 '18 at 15:37
  • Asking the same question over and over again is not going to win you any friends here. As should be clear from the comments, no one can understand the requirements (or the implementation constraints) as you've written them, so you need to come up with a way to clearly state or show what the inputs and the outputs of the system need to be, and exactly what must occur when. – Dave Tweed Apr 11 '18 at 15:39
  • Requirement is to have 4 led-s counting binary from 0 to 7 or to have 7 led-s lighting one by one or what? You can use two OA or two quadruple OA chips? – Dorian Apr 11 '18 at 15:56
  • Too broad, homework assignment with no effort and OP has asked for it to be deleted. – Finbarr Feb 23 '19 at 09:35

1 Answers1

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You say you are not allowed to use counter ICs..... How about making a counter IC?

Counters are made up of flip flops in series with each other. Flip flops can be made with logic gates, or if you are not allowed to use them either, they can be made with transistors. This would solve your LED sequence problem.

As for being able to do the whole thing during one high pulse.... you would have to build a small circuit that would oscillate 7 times during one pulse width to trigger your home made counter.

MCG
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