1、 First of all, let's popularize the classification and use of buzzers:
1. Buzzer is an electronic buzzer with integrated structure, which is powered by DC voltage. It is widely used as a sounding device in electronic products such as computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephones, timers and so on.
2. Buzzers are mainly divided into piezoelectric buzzers and electromagnetic buzzers.
3. Instructions for the use of circuit graphic symbols of the buzzer. The buzzer is represented by the letter "H" or "ha" (the old standard used "FM", "LB", "JD", etc.).
2、 Briefly describe the structure and principle of buzzer:
1. Piezoelectric buzzer is mainly composed of multivibrator, piezoelectric buzzer, impedance matcher, resonance box, shell, etc. Some piezoelectric buzzers are also equipped with light-emitting diodes on the shell.
The piezoelectric buzzer is made of lead zirconate titanate or lead magnesium niobate piezoelectric ceramic materials. Silver electrodes are plated on both sides of the ceramic sheet. After polarization and aging treatment, they are bonded with brass sheet or stainless steel sheet.
Multivibrator consists of transistor or integrated circuit. When the power supply is connected (1.5 ~ 15V DC working voltage), the multivibrator vibrates and outputs an audio signal of 1.5 ~ 2.5KHz, and the impedance matcher pushes the piezoelectric buzzer to sound.
2. Electromagnetic buzzer electromagnetic buzzer is composed of oscillator, electromagnetic coil, magnet, vibrating diaphragm and shell.
After the power is turned on, the audio signal current generated by the oscillator passes through the electromagnetic coil to generate a magnetic field. The vibrating diaphragm vibrates and sounds periodically under the interaction of electromagnetic coil and magnet.
For more information, please visit Dongguan Shengchang electronic official website or consult Mr. Xie 13559793345. Shengchang electronics focuses on the production and R & D of buzzer and atomizer products, and is always committed to building safe, stable and certified products in line with national standards.