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Piezo Transducers
www.db.com.hktion plate bend to generate sounds.

The acoustic generating method can be roughly divided into self-drive oscillation method and external drive oscillation method. The former shows the lowest impedance on the acoustic generator, and produces the sound by the positive feedback oscillation circuit to make resonance. Thereby, big sound pressure can be obtained by a simple circuit. While the latter selects an optional frequency and makes sound by the nonstable multivibrator, and it is used for the case having the oscillation circuit.
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