[sdiy] faulty switch causing bounce?

[cheater cheater]

On Fri, Aug 27, 2010 at 17:19, Speth, John <John.Speth at coherent.com> wrote:
> Even the best switches will eventually bounce.  It's a real shame when expensive switches bounce in their infancy.  The RC filter (a great inexpensive solution) will prolong a bouncy switch's useful life but will eventually cease to provide the filtering needed by a constantly degrading switch.  You can buy switch debouncing ICs (at least you could 7 years ago when I looked).  I never used one.  Software debouncers can be very flexible and quite useful but it's quite an expensive solution if debouncing is the only thing your embedded MCU is needed for.
>
> The best debouncer I've ever used is a SPDT switch and an SR latch (flip-flop?).  That's what I would use for important heavy-use switches like a sequencer manual step switch.

Very interesting - how does that work?

Cheers,
D.

> Unfortunately, whatever method you choose, the switch will eventually need to be replaced.  Debouncers just keep them in service longer.
>
> John Speth
> mailto:john.speth at coherent.com
>
>> -----Original Message-----
>> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
>> bounces at dropmix.xs4all.nl] On Behalf Of mark verbos
>> Sent: Thursday, August 26, 2010 7:36 PM
>> To: Synth DIY
>> Subject: Re: [sdiy] faulty switch causing bounce?
>>
>> I replaced the switch and it works as expected. That is a pretty
>> expensive switch to be still born. Jeez.
>>
>> Mark
>>
>>
>>
>> On Aug 26, 2010, at 10:29 PM, mark verbos wrote:
>>
>> > Is it possible for a bad switch to cause bounce? I have a C&K
>> 7105 (on) off (on)  set up as an advance switch on a sequencer. If
>> I push it one was it works fine, but the other way makes the
>> sequencer count 2 steps. I have a 2.2M resistor to ground and a
>> .05 uF cap to the positive rail. This setup has worked fine for me
>> many times before. I'm confused, how can it be only when the
>> switch goes one way?
>> >
>> > Mark
>> >
>> >
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