Magnetic Buzzer Structure-How Magnetic Buzzer Working ?

Magnetic Buzzer Structure

This illustration highlights the structure of a typical magnetic buzzer. Like piezo technology, magnetic buzzers are available in transducer and indicator configurations. In a magnetic buzzer, the transistor acts as the driving circuit. Indicators include the transistor, creating a tone when a dc voltage is applied. Transducers lack this transistor, requiring a square wave signal to operate properly.

No.	Name of Parts
1	Casing
2	Vibrating Weight
3	Cavity
4	Vibrating Disk
5	Magnet
6	Pole
7	Coil
8	Yoke Plate
9	PCB
10	Transistor
11	Epoxy
12	Pin

Magnetic buzzer is an electromagnetic sound-generating device that uses a coil to attract a ferromagnetic diaphragm, producing sound via vibrations when current flows. Operating at low voltages (1.5~30V) and higher currents (20~60mA), they are frequently used in electronics for their 1~3kHz frequency range, durability, and suitability for SMD automated placement

Operating Principle: Uses an electromagnet and a diaphragm, functioning similarly to a miniature speaker.
Performance: Generally produces a lower, clearer, or more natural sound (1~3 kHz) compared to the higher, piercing pitch of piezo buzzers.
Power Requirements: Typically operates at low voltages (e.g., 1.5V, 3V, 5V, 12V) but requires higher current (20~60mA).
Applications: Ideal for alarms, timers, and indicators in consumer electronics due to their compact size and reliability.
Types: Available in surface-mount (SMD) and through-hole

Internal Driven Magnetic Buzzer (With oscillator circuit)

Work  with Rated D/C Voltage , For all kinds of instruments and home appliance alarms,

and has an advantage of stability .

External  Driven Magnetic Transducer Buzzer (Without oscillator circuit)
Worked with 1.5~12V p-p 2400Hz ,Output 85dB at 10cm.