What is the structural principle of the pin buzzer?

Do you know what the structural principle of the buzzer is? Let's follow the small series of pin buzzer to have a brief understanding of it!
1. The piezoelectric buzzer is mainly composed of a multivibrator, a piezoelectric buzzer, an impedance matcher, a resonant box and a housing. Some piezoelectric buzzers are also equipped with light emitting diodes. The multivibrator consists of a transistor or an integrated circuit. When the power is turned on (1.5-15V DC working voltage), the multivibrator starts to vibrate and output a 1.5-2.5kHZ audio signal, and the impedance matcher pushes the piezoelectric buzzer to sound. The piezoelectric buzzer is made of lead zirconate titanate or magnesium niobate piezoelectric ceramic material. Silver electrodes are plated on both sides of the ceramic plate, and after polarization and aging treatment, they are bonded with brass plates or stainless steel plates.
2. The 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, causing the electromagnetic coil to generate a magnetic field. The vibrating diaphragm is periodically vibrated by the interaction of the electromagnetic coil and the magnet.
Changzhou Fuhongda Electronics Co., Ltd. produces buzzers, horns, alarms, microphones and other electroacoustic devices. It is a high-tech enterprise integrating R & D, production and sales. To sum up, this pin buzzer editor describes the structure and principle of the buzzer. I hope you can learn more about it through the introduction of the above editor. If you want to know more suggestions, you can pay attention to this website, and there will be relevant articles to update it later.