Let’s talk about stomp boxes…
Made one with piezo, and was completely underwhelmed. Not ready to blame the piezo, but maybe. I think could have been other issues too. So,….
1. The box. Large, small, fat, thin, thick wood, thin wood? Have several to choose from, am considering a Macanudo approx. 8x8x2.5, or a Padron similar to this…
https://cigarstandard.com/wp-content/uploads/2015/11/77084.jpg
I also have ¼” and 1/8” Swedish ply that I can make a top from. Also some printed circuit .062 fiberglass substrate.
2. Large or small diameter piezo, or a small speaker as pup? Maybe a metal sheet mounted over a magnetic pup?
3. Stompbox will be run thru a stand-alone preamp (7545R).
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I got a good result from a large wooden with a box 5 inch 8W speaker glued in one corner to the back and two piezo discs glued to the lid. Wiring them with a blend pot gave a good variation in sound. Using the two different types of microphone (speaker and piezo) made it sound like bongos if you tapped different places).
The two knobs were blend and volume.
I'm kinda going that way, I have a bunch of small speakers, from some small 1x2 ovals to a big 6 inch heavy sub woofer, and a couple tweeters and lots in between. I also picked up a vouple plastic cases, sort of like small briefcases/tool/pistol cases. They go 'thump' rather nicely.
I made a few a while back and got one that sounded pretty good. I used 3 piezo discs and a ukulele preamp (turn the bass all the way up and treble all the way down). It sounds okay, but I still tend to EQ out some of the midrange when I record it. I've thought about soldering a capacitor on the output jack to filter out some of the midrange permanently... but I've just never got around to doing it. The preamp makes a big difference when dealing with piezos.