[sdiy] faulty switch causing bounce?

[Harry Bissell]

right on target !!!

H^) harry

----- Original Message -----
From: Tom Wiltshire <tom at electricdruid.net>
To: cheater cheater <cheater00 at gmail.com>
Cc: Synth DIY <synth-diy at dropmix.xs4all.nl>
Sent: Fri, 27 Aug 2010 11:42:28 -0400 (EDT)
Subject: Re: [sdiy] faulty switch causing bounce?


On 27 Aug 2010, at 16:35, cheater cheater wrote:

>> 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.

My guess: The switch common goes to +5V, one way goes to S and the other to R, which are both tied low with a decent resistor - maybe 10K. If you switch the switch to "S" the flip-flop will get set (S goes high) and bounces will just be further pulses attempting to set the flip-flop. Likewise for Reset - the first contact will reset the flip-flop low, and repeated pulses caused by bounce have no effect.

Am I close?

T.



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-- 
Harry Bissell & Nora Abdullah 4eva