What is the structure of the electromagnetic buzzer?


IbSoe-_VR3Otr24eJ0YI7g.pngThe electromagnetic buzzer is one of the buzzers. Unlike the electronic buzzer, the electronic buzzer is an electronic buzzer that uses an electronic coil to act on the buzzer to make a sound in electronic products. Buzzer is an integrated structure of the electronic signal buzzer is mainly divided into piezoelectric buzzer and electronic buzzer two types. The buzzer is displayed in the loop as the letter "H" or "HA" (existing standards are displayed as "FM", "ZZG", "LB", "JD", etc.).

What is the structure of the electromagnetic buzzer?

1, Manual

Resonator Sealed buzzer On the contrary, it is suitable for high current specification/high frequency range response sound, and the sound quality is very good. (about 40 ~ 80mA * 500Hz).

2. Active.

active (qualified) buzzer vibration coil and vibration coil are combined.

buzzer is divided into two types of piezoelectric and electronic. The piezoelectric buzzer is the piezoelectric effect of piezoelectric ceramics, which generates sound by guiding the vibration of the metal sheet. The electronic buzzer is an electromagnetic principle. It can absorb the metal diaphragm when energized, and rebound according to the elasticity of the diaphragm when not energized. Therefore, the pressure buzzer is driven by a square wave, and the electronic type is driven by a 1/2 square wave. The pressure buzzer requires a higher voltage to have sufficient sound pressure. It is generally recommended to be above 9V. Piezoelectric part of the specifications can reach more than 120dB, large can easily reach 100dB.

electronic buzzer: the voltage is 1.5V, can produce more than 85dB sound pressure, only the current consumption can be much higher than the voltage buzzer, in the same size, the response frequency of the electronic buzzer may be relatively low. The sound pressure of the electromagnetic buzzer can generally be as high as 90dB. Mechanical buzzers are a small category of electromagnetic buzzers.

What is the structural principle of the electromagnetic buzzer?

1. Voltage buzzer The piezoelectric buzzer is mainly composed of a multi-vibrator, a piezoelectric amplifier, an impedance matching box, a resonant box, and a shell. Some piezoelectric buzzer housings are also equipped with light-emitting diodes.

The multivibrator is composed of transistors or integrated circuits. When the power supply (1.5~15V DC working voltage) is turned on, the multivibrator vibrates and outputs an audio signal of 100~500HZ, and the impedance matching device emits the sound of the voltage motor.

Piezoelectric Seals are made of lead titanate or lead magnesium acid pressed ceramic materials. Both sides of the ceramic sheet are plated with silver electrodes, and after polarization and aging treatment, they are glued together with brass or stainless steel sheets.

2. Electromagnetic buzzer The electromagnetic buzzer is composed of an oscillator, a solenoid, a magnet, a vibrating diaphragm and a housing. After

is energized, the audio signal current generated by the oscillator passes through the electromagnetic coil to make the electromagnetic coil generate a magnetic field. The diaphragm periodically vibrates under the interaction of the electromagnetic coil and the magnet to produce sound.

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