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The piezoelectric speaker consists of a piezoelectric crystal connected to a metal membrane.
Buildup:

 ______________________
|______________________| Membrane
    |##############|    piezoelectric crystal 
     """"""""""""""     electrode

The other surface of the crystal is metalized to create an electrode. The membrane also serves as an electrode When a signal source is connected to the electrodes the crystal expands and contracts in relation to the signal, this makes the membrane vibrate and thus creates soundwaves.

The piezoelectric speaker is compact, only about 1mm thick but is best suited for higher frequencies. They are used in electronic alarm clocks, buzzers and other applications where a small soundsource is needed.

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