This basic piezo sensor from Measurement Specialties is often used for flex, touch, vibration and shock measurements. A small AC and large voltage (up to +/-90V) is created when the film moves back and forth. A simple resistor should get the voltage down to ADC levels. Can also be used for impact sensing or a flexible switch.
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Plate Material: Brass
It's suitable for installing in cigar box guitars, foot stompers and other home-made instruments
They can also be used for custom pickup arrangements in more traditional stringed and percussion instruments
Resonant Frequency (kHz): 4.6 +/- 0.5kHz
Resonant Impedence (ohm): 300 max
Capacitance (nF): 20.0 +/- 30% [1kHz]
Lead Length: Approx.5.7cm/2.24''
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