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Self Driving Piezo Buzzer

Why do some piezo elements have three wires?

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Most piezos have two connections, but this type has three. They are called self-drive types, and they're meant to be used as part of the oscillator.

The piezo effect works both ways: if you apply a voltage the piezo stretches, but also if it stretches it creates a voltage. This principle is used to create a feedback signal which drives the oscillator.

The advantage of the self-drive is that it will automagically work at its resonance frequency, where it produces the loudest sound.

You need:
Piezo
2N2222A transistor (or some other NPN transistor)
150K ohm resistor
3.9K ohm resistor
620 ohm resistor

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Ken Yap wrote 07/30/2020 at 23:42 point

>Most piezos have two connections, but this type has three. They are called self-drive types, and they're meant to be used as part of the oscillator.

Thanks, learnt something today.

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Tauno Erik wrote 07/31/2020 at 05:48 point

Thank You!

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