AIR_PRESSURE_CHANGE_DETECTOR

Published:2009/7/10 4:15:00 Author:May | From:SeekIC

A piezoelectric detector (BZ1) is used in this circuit to detect a change in air pressure. BZ1 produces a voltage that is amplified by U1A and UlB. Frequency response is limited to low frequencies. The signal is rectified by D1 and D2 and drives Q1, which activates BZ2, a piezoelectric buzzer.



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