I made a stompbox which is basically a small wooden box with a piezo element inside that when stomped on produces a sound similar to a bass drum except that the thing is much more portable.
The circuit works but I have two problems with it that I don't know how to solve:
- It's extremely loud. I hooked it up to two different soundboards and even with the gain at 1 this was super loud.
- The circuit produces a really loud and constant "crackly" hiss. The hiss remains at the same apparent loudness regardless of what the gain pot on the soundboard is.
The circuit in question is this: