[sdiy] channel changer/bypass

[Michael Ruberto]

Last night I got the idea to use a 4013 and a 4053. The flop-flops would be 
cascaded to form a 2 bit counter. The 1st bit can drive the switch for 
lead/rhythm. The 2nd bit will drive the remaining 2 switches for bypass. A 
sequence of 3 "stomps" on the footswitch will result in this:
rhythm > Lead > bypass

The trick here will be to reset the 4013 before it gets to binary 4. By 
using bit 1 and bit 2 I can force the reset by applying these 2 signals to a 
2 diode AND gate whos output goes to the 4013 reset pin. As soon as the 
counter hits 4 it resets back to 1.

This is cool. While searching for the datasheet of the 4053 I found an 
article with examples of how to use the chip for this very application:

http://www.geofex.com/Article_Folders/cd4053/cd4053.htm

M. A. Ruberto

>From: "Tim Parkhurst" <tim.parkhurst at gmail.com>
>To: "Roy J. Tellason" <rtellason at verizon.net>
>CC: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] channel changer/bypass
>Date: Tue, 24 Oct 2006 07:20:19 -0700
>
>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

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