How does the buzzer work?

The working principle of the buzzer is mainly based on the piezoelectric effect or electromagnetic effect. By changing the input voltage, frequency or trigger signal, the sound frequency and intensity of the buzzer can be controlled to achieve different tone and volume effects.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

A buzzer is an electronic device used to emit sound signals. Its working principle is mainly based on the piezoelectric effect or electromagnetic effect.

1. Piezoelectric Buzzer: This buzzer uses the piezoelectric effect to produce sound. It usually contains a piezoelectric ceramic crystal inside. When an external voltage is applied to the piezoelectric crystal, the crystal produces mechanical vibrations, thereby producing sound. This vibration is amplified and emitted through the resonance cavity of the buzzer.

2. Electromagnetic Buzzer: This buzzer uses electromagnetic effects to produce sound. It contains a coil and an iron vibration piece inside. When the alternating current passes through the coil, the coil will generate a magnetic field, attracting the iron vibrator to vibrate with it. Through the vibration of the vibrating plate, periodic compression fluctuations are formed in the air, thereby producing sound.

Whether it is a piezoelectric buzzer or an electromagnetic buzzer, they all require an external power supply and corresponding circuit control when working. By changing the input voltage, frequency or trigger signal, the sound frequency and intensity of the buzzer can be controlled to achieve different tone and volume effects.

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