[sdiy] channel changer/bypass

[Tim Parkhurst]

On 10/24/06, Roy J. Tellason <rtellason at verizon.net> wrote:
> On Monday 23 October 2006 17:50, Ken Stone wrote:
> > My Sequential switch would do it. You'd need to tie the highest address
> > line to the 4051 low to keep it to a 4 state cycle.  Have a look at my
> > analog switch matrix too, for tricks on wiring up a 4066. You'd need
> > something like a 4017 to do the selecting on this.
> >
> > Ken
>
> Why would you want a 4017 (which has sequential outputs) when the 4051 has
> binary select inputs?
>

I think the method here would be to debounce the footswitch and use
this as the "clock" to drive the 4017. Each time you press the switch,
a new 4017 output goes high. Use the first three outputs to control
analog switches (4066), and tie the fourth output back to reset. This
gives you:
Switch -> Debounce -> 4017 -> 4066

versus:
Switch -> Debounce -> Binary Counter -> 4051
Plus a few gates to decode the binary count and reset the counter.
Also, the frist approach might be a little more versatile because the
4066 switches are all separate, while the 4051 is a multiplexer so one
side of the switches are all teid together. The two approaches are
pretty close, but the 4017 might be a little simpler.


Tim (a lot simpler) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein