Air-Pressure Change Detector

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

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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