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Air-Pressure Change Detector

2017-09-02 07:02  
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A piezoelectric detector (BZ1) is used in this circuit to detect a change in air pressure. BZ1 produces a volt
Air-Pressure Change Detector

age that is amplified by U1A and UXB. Frequency response is limited to low frequencies. The signal is rectified by D1 and D2 and drives Ql, which activates BZ2, a piezoelectric buzzer.

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