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Piezo elements come in handy when you need to detect vibration or a knock. You can use these for tap or knock sensors pretty easily by reading the voltage on the output. They can also be used for a very small audio transducer such as a buzzer.

Datasheets Piezoelectric Sound Components
Frequency 6.3 kHz
Impedance 1 kOhm
Capacitance @ Frequency 10000 pF @ 1 kHz
Size 0.79" Dia (20 mm)


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