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how do i make a wah pedal?

The hard part about making a wah pedal is making the actual foot-treadle and housing. The circuit itself is very simple and easy. But manufacturing a treadle that works properly and smoothly, and doesn't break, takes a lot of resources that most people just do not have.

What many hobbyists do is buy an old volume or wah pedal that needs the circuit repaired, and just put in a new circuit of their choosing.

But think about it--you have to buy a broken wah pedal, and buy new parts for it, and buy a soldering iron and accessories... At some point you realize you could have just bought a used wah pedal that was still in good working order, and spent about the same money.