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.
Resonant Frequency(kHz): 6.3 ±0.6kHz
Resonant Impedance (ohm): 1000 max
Capacitance (nF): 10.0 ±30% [1kHz]
Diameter : 20mm
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