I’m looking to add an expression pedal input to my guitar pedal design. I have some question about how to best achieve this.
It’s my understanding that an expression pedal is basically just a passive device with a pot in it attached to a level (at least mine seems to be so). So I was thinking it would be as simple as just adding a TRS jack to my pedal, connecting GND, ring to 3v3A, and tip to one of the ADCs on the Daisy seed. However, I took at a look at the Daisy Petal schematics and I’m seeing there are some op amps involved:
Do the op amps somehow protect the seed from a short though the expression pedal, or am I missing something as to why they are necessary?