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A piezo buzzer contains a piezoelectric element combined with an in-built oscillator / driver to produce an audible sound. While the output frequency is fixed using them is as simple as applying a DC voltage within the specified range.

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What's the third wire on a piezo buzzer?

Here is a good in-depth explanation of buzzers including self-driven ones + some usefull schematics: Piezoelectric Sound Components Application Manual (812kb). Excerpt (from p.5): Self Drive Method …
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