[sdiy] Pressing buttons

[cyborgzero at comcast.net]

----- Original Message -----
From: "jhaible" <jhaible at debitel.net>
To: ">>>marjan<<<" <urekar.m at EUnet.yu>; "Synth-DIY"
<synth-diy at dropmix.xs4all.nl>
Sent: Sunday, May 12, 2002 3:19 PM
Subject: Re: [sdiy] Pressing buttons


>3-input OR gate
> (diodes ...) on each Reset input.
> Button 1 is connected to SET of FF1
> and to RESET (via the OR) to all other FF's.

Ah, yeah, I forgot that.. This is prlly the better way, since it
literally *blocks* the other 3 inputs once an input is recognized,
which will keep you from possibly having 2 buttons read in.. Not
likely, but this method is safer.

Bouncing and glitches would be the most difficult thing to deal with
in this case.

I was wondering about an even more crude, but more failsafe front end
using transistors whereby you could do both the debounce/deglitch
stages *and* the one and only one selections together.

Anyway you look at it, its not very elegant no matter what you do. ;)
But, chances are, for most apps it will work.

Rob