This simple alarm with integrated CMOS sounds a piezoelectric transducer when the sensor circuit is opened. The circuit is from old documentation and can be used as an alarm or warning shield. The produced sound is a 2 kHz tone given by C1.
This simple alarm with integrated CMOS sounds a piezoelectric transducer when the sensor circuit is opened. The circuit is from old documentation and can be used as an alarm or warning shield. The produced sound is a 2 kHz tone given by C1.