So firstly I live on an Island, I get my supplies from e-bay, and it takes a month or more to get it here. So I'm not looking for a "go buy one" answer.
it looks to me like their are 4 Piezos wired in series.
1.) First question: I have some "12mm Piezo Elements Sounder Sensor Trigger Drum Disc + wire copper" are they suitable?
2.) Are Piezos directional? it looks like they are perpendicular to the face of the bridge; does it matter? It would be much easer to glue them parallel to the bridge.
this was my first prototype:
I cut the discs into rectangles; first I stuck them to a bridge to prove the concept, then cleaned up the long cables, and glued them to a bridge and sandwiched them between a thin peace of wood (with a cavity for the solder bumps).
It sounded good, but very hot (loud) I guess because they are in series the voltage (signal) increases for every one added?
3.) I also had a wicked hum! Obviously a shielding problem, any suggestions?
4.) last question: I have heard that having reversed polarity is a "good thing" what is that all about? I think that the new generation of Barbera bridges have 8 elements, one on each side of the string, and their polarity is opposite. This is just a guess..... anyone have anything productive to say about that?
Thanks for your time, excited to start on version 2.0