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Use a piezo disc as a driver.
Use a piezo as a little speaker.
- mini amplifier with output jack for external speaker;
- piezo-electric disc;
- plug to match amp output;
- small audio output coupling transformer (RS 273-1380 or equivalent);
- few feet of lightweight speaker cable or stranded hookup wire;
- electrical tape;
- can of plasti-dip;
- small spring clamps;
- sound source, such as a CD player and cable to connect it to the amp input;
- optionally a female jack to match the plugs you are using.
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