[sdiy] Minimum parts count switch de-bouncer.

[xamboldt]

Check out the debounce circuit on the Wiard joystick:

http://www.musicsynthesizer.com/Joystick/1209.htm
(at the bottom of the page)

I've built a dual clone of this circuit, but haven't received my  
pushbutton switches yet, so I can't comment on how well it works,  
other than to say that Wiard has a good reputation and that the  
joystick part works great. :)

Scott Juskiw has practically the same debouncing circuit on his page  
about modding the Encore UEG
http://www.tellun.com/motm/mods/ueg/ueg.html

Hope these help!

-Chris






On Apr 11, 2006, at 4:52 PM, Dave Kendall wrote:

> on 11/4/06 21:35, wayfar at synth at wayfar.net wrote:
>
>> Why not use a cap in a low pass arrangement for debouncing?
>
> Thanks Wayfar.
> I haven't come across that solution so far - all the info I've found
> regarding debouncing have come from a textbook, and a couple of EDN
> articles, and all suggest CMOS NOT gates.
>
> How does a Cap LPF work, and what are the advantages or disadvantages?
>
> I'm at that exciting/frustrating stage of DIY building where I make  
> some
> great leaps, only to realise that I don't know about something  
> simple, and
> then hit a brick wall.....
>
> A friend calls it the "everyone knows" syndrome..
>
> Such are the perils of teaching yourself (on a tiny budget) :-)
>
> cheers,
>
> Dave
>
>
>
>>
>> Dave Kendall wrote:
>>
>>> Hi all.
>>>
>>> I've got a load of 406UBs, and quite a few CD40106s lying around.  
>>> I found a
>>> schemo for a switch debouncer using 2 stages of a 4069, but it's  
>>> inverted in
>>> output, so probably needs 3 stages, and works on  0V +5V. (will  
>>> test it
>>> later tonight hopefully)
>>>
>>> Does anyone know of a debouncer circuit that will operate on GND  
>>> and +15V
>>> that uses fewer stages of either a 4069 or 40106? (ideally only  
>>> one stage,
>>> but that's probably pushing it...)
>>>
>>> I'm trying to get the parts count down for a control and audio  
>>> switching
>>> board that I'm building for a DIY monosynth.
>>>
>>> The momentary switches I'm using are relatively good ("D6 type" from
>>> memory?), but rapid switching sometimes produces false triggers.
>>>
>>> cheers,
>>>
>>> Dave
>>>
>>>
>>>
>>>
>>
>