The buzzer is an integrated electronic sounder
Time:
2023-06-13 22:15
Source:
Buzzer is an integrated electronic sounder powered by DC voltage, widely used as a sound device in electronic products such as computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephones, timers, etc. Buzzers are mainly divided into two types: piezoelectric buzzers and electromagnetic buzzers. The buzzer is represented by the letters "H" or "HA" in the circuit (old standards used "FM", "ZZG", "LB", "JD", etc.).
Structural Principles
1. Piezoelectric buzzer Piezoelectric buzzer mainly consists of a multi harmonic oscillator, piezoelectric buzzer, impedance matching device, resonant box, shell, etc. Some piezoelectric buzzers are also equipped with light-emitting diodes on their shells.
A multivibrator is composed of transistors or integrated circuits. When the power is turned on (with a DC working voltage of 1.5-15V), the multi harmonic oscillator vibrates and outputs an audio signal of 100-500HZ. The impedance matching device pushes the piezoelectric buzzer to produce sound.
Piezoelectric buzzer [1]
It is made of Lead zirconate titanate or lead magnesium niobate piezoelectric ceramic materials. Plating silver electrodes on both sides of the ceramic sheet, polarizing and aging treatment, and then sticking it together with brass or stainless steel sheets.
2. Electromagnetic buzzer The electromagnetic buzzer consists of an oscillator, electromagnetic coil, magnet, vibrating diaphragm, and casing.
After turning on the power, the audio signal current generated by the oscillator passes through the electromagnetic coil, causing the electromagnetic coil to generate a magnetic field. The vibrating diaphragm periodically vibrates and produces sound under the interaction between the electromagnetic coil and the magnet.
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