Radio Buttons (was: Debouncing alot of switches)

[Rob]

jhaible wrote:
> 
> Related topic to debouncing pushbuttons:
> 
> I was thinking about a set of "radio buttons" recently, i.e. an array
> of electronic switches where selecting one pushbutton de-selects
> all the others. The most straight forward approach would be a flip
> flop for each switch, and pressing one switch would reset all flip
> flops over a common "reset" line, and only set the single one that
> belongs to the switch with an individual "set" signal. Or a schmitt
> trigger for each switch, with all schmitt triggers getting a "weak"
> (high impedance) low signal, and only the selected one getting
> a "strong" (low impedance) high signal.

Why not just have ANY button press trigger a high edge trigger circuit
that hits ALL the clears of the flip-flops? That means that the button
you want and the one that stays on AFTER clear pulse (due to you holding
it) will be the one that will stay in the flopped state. I dont know if
it will work, but try it.. 

Rob