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Date: 08/06/02 at 8:20 PM
Posted by: Mike
E-mail: msleger@mindspring.com

In Reply to: Re: How Can I Produce a Triggerless One-Shot? posted by David Ashby on 08/06/02 at 10:15 AM:

Well, I was excited about using the R-C circuit to provide the one-shot, but the counter chip is being reset only about 60% of the time. This is not good enough. It needs to be initialized 100% of the time on startup. Also, there isn't enough current drive through the R-C circuit for the second purpose of the one-shot...powering an LED array. The LED array is connected to Master Reset of the counter and everything works when switched manually. When I manually hold Reset high, the LED array is lit and counting is suspended. Then, when I switch Reset low, the LED array is disabled and counting begins (always) from zero. I just need to accomplish this automatically as part of the circuit rather than a manual switch. The R-C won't drive the LEDs, and the counter doesn't predictably start at zero. Any other ideas?

Mike

Follow Ups:

  Re: R-C circuit didn't work David Ashby   Posted at: 08/09/02 (3)

  umm, Schmitt what? Mike   Posted at: 08/09/02 (2)

  Re: umm, Schmitt what? David Ashby   Posted at: 08/12/02 (1)

  Off to get a Schmitt trigger chip... Mike   Posted at: 08/12/02 (0)

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