Buzzer Circuit Principle

Buzzer is a commonly used sound warning device, widely used in various electronic products. Its principle is to send out a certain frequency of sound through the circuit control, to play the role of reminder or warning.

The basic principle of the buzzer circuit is to use the current through the magnetic bead that produces the sound, so that it vibrates to emit sound. Generally speaking, buzzer circuits are mainly composed of oscillators, amplifiers and outputs. The function and working principle of each of these parts will be described below.

First is the oscillator part, which is the core of the buzzer circuit. The oscillator vibrates its internal components through an applied supply voltage and spreads sound through the air. Usually the oscillator is realised using an integrated circuit or a crystal oscillator.

Next is the amplifier section, the amplifier's role is to increase the oscillator output signal, making the sound bigger and clearer. The amplifier is usually an amplifier circuit or an integrated power amplifier.

Finally, there is the output part, the output is to transmit the amplified signal to the diaphragm of the buzzer, through the vibration of the diaphragm to produce sound. Generally, the output device is a driver circuit or a power output device.

The working principle of the whole buzzer circuit is: when the power supply is energised, the oscillator starts to oscillate to produce a certain frequency signal, which is amplified by the amplifier and output to the outputter, which transmits the signal to the diaphragm, which then vibrates to produce sound.

It should be noted that the buzzer circuit needs to be reasonably designed circuit parameters, so that the frequency of the oscillator output and the loudness of the sound suitable for the application of the occasion. In addition, the selection of the appropriate oscillator, amplifier and output components are also important factors affecting the sound effect.

In summary, the buzzer circuit through the oscillator, amplifier and output and other parts of the mutual cooperation, to achieve the sound generation and output, play a reminder and warning role. It is hoped that through the introduction of this article, readers can have a deeper understanding of the working principle and application of buzzer circuits.