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Piezoelectric buzzers use piezoelectric materials, which generate charges when subjected to external forces that cause deformation of the piezoelectric material. Similarly, piezoelectric materials undergo deformation when energized.
Electromagnetic buzzers are widely used as sounding devices in electronic products such as computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephones, timers, etc.
The electromagnetic buzzer consists of an oscillator, an electromagnetic coil, a magnet, a vibrating diaphragm, and a casing. After the power is turned on, the audio signal current generated by the oscillator passes through the electromagnetic coil
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