[sdiy] Minimum parts count switch de-bouncer.

Dave Kendall davekendall at ntlworld.com
Wed Apr 12 22:13:23 CEST 2006


Hi Tim.

Thanks.

So, it should be like this for positive going transition?
 
             I-------------------------I>o------------o out
             I                      schmitt trigger
GND          I  
 I     sw    I   I------I 10KI-------I
 I    ____   I   I                   I
 I----o  o-------I                   I
                 I             +     I
                 I------II 1uF II----I----+15V

I haven't got any ceramic 1uF caps, but I guess 100nF and 100K would give
the same result, ie 10ms? I don't know how much extra delay the schmitt
trigger (40106) would add. But if it's propagation delay, then probably not
much in the scheme of things...

cheers,

Dave



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