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Step 10Piezo speaker
A piezo diaphragm consists of a brass plate, usually round, which has a round piezo element cemented to it. One connection is the brass plate and the other is the silvered surface of the piezo element.
This, by itself, does not sound loud enough to be heard. Its volume can be boosted by coupling it to a resonant chamber.
Here, I have used the hub from a 3 1/2" floppy disk for the chamber. It has a rounded rectangular cutout which I plugged with a piece of circuit board, drilled to accept the two wires that connect to the piezo element.
The two are stuck together using superglue. The reulting resonant piezo speaker is quite loud, over the range of notes in which it is resonant.
This, by itself, does not sound loud enough to be heard. Its volume can be boosted by coupling it to a resonant chamber.
Here, I have used the hub from a 3 1/2" floppy disk for the chamber. It has a rounded rectangular cutout which I plugged with a piece of circuit board, drilled to accept the two wires that connect to the piezo element.
The two are stuck together using superglue. The reulting resonant piezo speaker is quite loud, over the range of notes in which it is resonant.
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