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piezoelectric transuduser - speaker

3.50€
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The sound they make depends on the signal you drive them with. They don't make a "high pitched" sound on their own just because power is applied. Just to make a beep, you generally apply a square wave. These things have limited frequency range, usually centered around 1.5-2 kHz. They aren't much good for reproducing general sounds like voice or music, but are fine for artificial sounds like clicks and beeps where you can pick the frequency

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