Vibration alarm circuit
Source: InternetPublisher:Lemontree Keywords: Alarm circuit piezoelectric ceramics time base circuit Updated: 2021/02/03
Working principle of the circuit: This circuit uses an integrated circuit ICM7556, two piezoelectric
ceramics X1 and X2 and several passive electronic components to form a mechanical vibration alarm, which can
produce an alarm sound for 1 minute. As long as mechanical vibration is applied to the piezoelectric ceramic X1 ,
a voltage will be generated on the 10 MΩ resistor at pin 6 of IC1 (A), triggering the time base circuit
7556, causing the piezoelectric ceramic X2 to sound an alarm. The second time base circuit IC1(B) generates
a self-excited signal modulated by a low frequency of 5 Hz.
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