> Additionally, there is no such thing as a bounce-free switch.
> 
> An RC mechanism is not reliable.

I'd disagree with that a little. An optical interrupter followed
by an RC and ST is immune to practically all noise. I had to
make some for a marine envronment and they work as well
now as they did 15 years ago, despite being exposed to salt
air / water and dust and who knows what else. There is no
contact as such though, which is cheating I suppose

The Ganssle document is useful for mechanical switches, thanks

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