Just thinking out loud here.......

The idea of gluing a piezo inside a tuna can, or the like, and then mounting the tuna can under the bridge, open side up. Thinking being; the can will capture the vib's and add it's own coloration to the sound that the piezo is picking up. Anyone done this or have thoughts?

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I did a similar thing and glued one to the inside of a tin can guitar

Sounded awsome but had a lot of feed back issues

http://darrenscigarboxguitars.blogspot.co.uk/

I tried one on the inside of a canjo and the feedback was huge. Sort of like yelling inside a shipping container.

How about mounting the piezo to the outside of the can?  

Without encapsulating the piezo in something like foam, wood, leather or possibly a thick layer of hot glue or silicone to insulate it, I think you will find it will have an oversensitivity to every little sound and be a great feedback generator.

If foaming or casing it in glue would help with feed back, then sure. Is it the vibrations bouncing within the can that cause the feed back?

Don't know if you'd get the same sound mounting it outside the can, but don't know. My thought was sparked by the sound difference of speaking with a can up to your mouth.

I don't know the in's and out's of feed back causes and and remedy's (if you have a link with info, I love to read it ) so maybe it's not do-able. I'll fart around with experiments myself when time allows, but for now I'm living vicariously though you folks.

Primary problem with piezos is they are super sensitive so any resonance tends to continue and they will pick up all sorts of sounds when you just touch the strings or box. Encasing them helps to subdue this problem. Personally I enjoy the harsher sound they give. Half of the fun is experimenting and trying new ideas on your builds. "There are no rules", have fun with your build ideas.

You're right there, the only rule is, there are no rules! I made a thin wooden sandwich for my piezo and in the bottom piece I drilled a shallow hole with a forstner bit and lay the piezo on a layer of hot glue and added another layer on top, then covered the timber in hot glue before laying the top piece of timber on it and allowing it to set. I ended up with a quite thin sandwich of timber enclosing the piezo which I used as a base for my bridge.

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