guitar 4 way foot switch

how do l build a foot switch with a single input (from guitar) to 4 separate jack outputs? Only one of the outputs can be on at any time. Each output in the unit must have an LED to indicate what one is active.  Diagrams would be helpful .... thanks  :-)





Picture of guitar 4 way foot switch
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robertpool (author) 3 years ago
it all works fine as only one signal is sent to the mixer from the guitar (via the AB boxes and processors). I guess l could live with a ABC box but definitely not a ABY box as l do not require 2 simultaneous processors at the same time. What l really need is a ABCD box, but l have no clue how to wire one up. Do you know where l could get a simplified ABC diagram?
I kinda intimated there isn't really a way to simply make a multi-selection switcher--footswitches usually have only two states. Once you get beyond AB, it's gonna require more complexity, at least if you want a single button-press to do all the switching chores.

A rotary switch can do the job, but that's not really foot-friendly...

It's a little steep, but did you checkout the Joyo thing? (demo video) It can do what you want. It's different than your diagram-- essentially 8 different send/return loops in series, but it's programmable and would work as well.
robertpool (author)  gmoon3 years ago
as this is only for home use the Joyo was way to expensive. I will keep looking for a ABC wiring diagram, thanks for all your help.
One last thought: the only really simple way would be to use some sort of "radio button" switch. These are  switch banks that mechanically unselect the previous button press. Note that they must be latching switches, not momentary, to function the way you want.

Here's a few examples. None are really foot switches, however. Nor are they really an elegant way of solving the problem, as they are mechanically complex and less reliable than simple switches...

And this stuff is all obsolete--it's much cheaper to use a bank of momentary switches (or even just one) and switch digitally with today's technology. Like setting the time on a digital clock, or any device with a "mode" button.

Best of luck to ya.
robertpool (author) 3 years ago
thanks for that. Below is the current set up. Any advice on improving the signal flow would be appreciated.

AB Box Setup.jpg
Yep, that's a pretty complex way of doing what you want. Have you looked into any commercial switchers, like this Joyo device?

Here's a schematic for a guitar splitter, uses a tl074 quad opamp. Before I mentioned grounding the input--that's wrong, I was thinking of a mixer, not a splitter. Grounding each opamp output is the way to go here.

In it's simplest form, a foot switch on each output would ground the unwanted signal paths. But to select one exclusively, you'd need to stomp twice. But it would have the benefit selecting more than one path simultaneously. For more "automatic" selection of one path, some logic circuit would be needed--maybe with FET transistors acting as the "switch to ground."

Note that in your diagram you also mix the signals after the FX, but I assume that part already works OK.
gmoon3 years ago
So many ways to achieve this, but unfortunately none are really simple. 

Check out RG Keen's Geofex page on FX stuff, the section on "Signal Routing and Effects Order." The "Juggler" is a good link. It uses an CMOS analog multiplexer (basically an analog switch) to select an output. Some of the other links there use audio transformers to truly isolate the signals and avoid any ground-loop hum.

There are other ways to do it other than CMOS--even using relays is possible, but that would probably pop quite a bit with an audio signal. And you'd still need some type of simple logic circuit to select only one output, think Boolean logic here. A binary counter, some type of exclusive OR made of discrete chips or even a tiny multicontroller.

I'd be tempted to make a splitter with a quad opamp, then mute the the unwanted outputs with an optoisolator on the opamp inputs (ground those inputs)....would still need some type of logic to make it a single output only...