[sdiy] Debounce & hold +5v signal for 1/10 seconds

[harrybissell]

Hi Andreas...

if the one-shot time is longer than the input bounce... it is debounced
for free and
you don't need to do it again

Triggering a one-shot is a common debounce method in itself

H^) harry

Andreas Gaunitz wrote:

> Hi!
>
> Newbie disclaimer: I'm new to this list, as well as to electronics,
> except for some simple mods to synths, phones etc.
>
> I'm trying to find out how to build a "One shot gate-signal
> generator", trigged by a photo diode and a mechanical momentary swith.
> The length of the gate signal is to be set by a pot, and should be in
> the "few tenths of a second" range. Once the gate is on, it mustn't
> retrig until the time has elapsed.
>
> I've found a lot of info (web etc) on debouncing, using passive filter
> or RS latch. I have a hard time figuring how to set the hold time
> though... Should I use a 555? It seems a little over complicated.
>
> Anyone have an idea or a schematic?
>
> TIA!
>
> -Andreas, Stockholm
>