I'm trying to make a switching matrix for my guitar, so I can wire up all my pickups and switch between many different 'virtual' wiring schematics a.k.a. presets.
It would need to be 8x8, and I'm having trouble deciding which route I should go.
Route 1. I could use a Max7219 to control 64 optocouplers, only I can't seem to find any resistive type ones that aren't expensive at this quantity. Optocouplers that I did find for a good price and size are the LTV-816S chips, although these have a phototransistor instead of photoresistor. Would the transistor portion cause much distortion?
Route 2. I could make an 8x8 matrix of transistors (FET, MOSFET, JFET?) and shift registors.
I need this project to be cheap and small, and I only need on/off style routing. I have no need for fading/interpolation between presets.
Thanks for any insight, and I'm open to other suggestions as well.