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Subject: Looking for a particular switch debounce circuit...
From: John Rahn
User-Agent: Thoth/1.5.1 (Carbon/OS X)
Date: Fri, 04 Oct 2002 22:02:35 GMT
NNTP-Posting-Date: Fri, 04 Oct 2002 18:02:35 EDT
About (more than I think) twenty years ago (jeez I hate saying that)
I had a circuit diagram from Radio Electronics magazine. It was a very
simple switch debounce circuit that used only three parts; a resistor,
a small electrolytic capacitor and one gate from a 74LS series 2-Input
Schmitt Trigger NAND chip. The thing worked PERFECTLY. I have been
trying to duplicate the circuit (although now I am using the 74HC
series chips) but just can't seem to remember the correct connections,
or part values...
The reason I liked it was because of it's simplicity, and it worked so
well on SPST momentary switches. I had hacked the keypad out of my
dads' calculator (remember how expensive those little things were back
then?) and was using it for all kinds of stuff. And, like I said, the
debouncer worked beautifully.
Anyone know of a circuit like that?
Any help appreciated....
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