Cgs synth

R1
Switch
---/\/\/\/\/----
+V | |
| |\ 4001 |
<-----o------| /o----------o OUT
|/
Gnd

The switch is between +V and ground. The 4001 is a non-inverting
buffer, powered by +V. Let the switch be centered. On power up OUT may
be at ground or +V. Whichever it is, since it feeds back to the input
through R1, it will stay put. If it's at ground, then a momentary flick
of the switch to +V will cause the output to follow. The switch can
remain at +V, bounce off the contact, or move back to center (no
connection). OUT remains at +V. Nothing changes until the switch is
moved back to GND. At that instant OUT becomes zero volts and will
remain so, even if the switch is lifted (bounces). It is a simple
flip-flop.

Richard Brewster


rafe127 wrote:

> I guess it is about time I picked up the CMOS cookbook, I will order
> it tomorrow.
>
> Explain to me, if you will, the basic premise of this kind of
> debouncing. Will it still work for my purposes if the open and close
> of the switch are as much as one second apart? I'm just curious what
> the principle is.
>
> Thanks again,
> Rafael
>
> --- In cgs_synth@yahoogroups.com, bill bigrig <billbigrig@...> wrote:
>
>> Howdy,
>>
>> A good debouncing and flip/flop setup can be easily
>> found in "The Cmos Cookbook. It seems you are going to
>> have to debounce and eliminate one of the pulses. All
>> of this is covered in the book. It also explains "half
>> monostables", which might suit your purpose nicely.
>> rig
>>
>>
>> --- sasami@... wrote:
>>
>>
>>> What you are experiencing is called switch bounce.
>>> Try wiring a 10n (0.01)
>>> from the input to ground.
>>>
>>> Ken
>>>
>>>