[sdiy] Switch debounce

[David J. Hughes]

Hi Grant,

on 28/1/05 3:52 PM, Grant Richter at grichter at asapnet.net wrote:

> I have looked at that. It should be a popcorn part for under $1, but
> bugetary pricing is $3.47, which makes no sense for the function. A small
> capacitor across the switch is usually used instead.

Yeah, a small cap should get rid of all of the junk but, alas, it didn't.
The input was either as jumpy as goldfish on a hot plate or slugged to the
point of being unresponsive. Hence the use of the 14490.

I could have solved this in software - and indeed did with our Atem
prototype. I just didn't want to do complex digital filtering in a time
critical application like ZEIT. The software already has enough to do
scanning all of those lovely inputs.  ?:)

Cheers
    David

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Infection Music Limited.                     http://www.infectionmusic.co.uk

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