How buzzer works?

Piezo buzzer is an electronic transducer used for produce sounds. The buzzer had an outer case with two pins. Inside the buzzer it has piezo element, consists of a ceramic disc surrounded by metal disc.

The working principle is, whenever an electric potential is applied across a piezoelectric material, a pressure variation is generated. These pressure variation, push and pull the internal crystals in the piezo diec. The continuous push and pull operations generates a sound wave.

Piezoelectric disc

When we apply AC Voltage it deforms and produce sounds as proportional with Frequency of AC signal.

 

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