Piezo conducers have been around for years. They tend to be the things that make the 'done' beep in a microwave or the buzz of an alarm clock. Piezos and contact mics have been used extensively by ...
Piezo discs have been around since the 1970s, and such cheap (and easy-to-handle) discs are widely used by avid electronic hobbyists and experimenting musicians all over the world. A piezo disk ...
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