[sdiy] Passive debouncer

patchell patchell at silcom.com
Sat Apr 20 16:18:27 CEST 2002


    What I do to debounce switches is use an RC filter with a 74HC14 schmitt
trigger.  You need the hysteresis to complete eliminate the bouncing.

Peter Grenader wrote:

> I'm trying to use a mechanical switch as an option to advance a sequencer
> count (manual tuning).  I'm getting about 15 million steps for each touch of
> the switch due to it bouncing.  I don't want to run this into an active one
> shot, for reasons I don't need to go into.  Was hoping I could make a real
> simple passive rc on the faceplate, at the switch itself, to take care of
> it.  Tried hanging one at the wiper of the switch, didn't work.  POssibly my
> values didn't cut it.
>
> any suggestions?
>
> thanks in advance,
>
> Peter

--
 -Jim
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