The mechanical buzzer is a special sub-category of the electromagnetic buzzer, which consists of an oscillator, an electromagnetic coil, a magnet, a casing and etc.
Unlike ordinary electromagnetic buzzers, the vibrating piece of the mechanical buzzer is mounted on the outer casing, and its frequency is generally low, around 0.5 kHz. The general electromagnetic buzzer is around 2 kHz.
What is the pronunciation principle of mechanical buzzer?
After the power is turned on (as small as 1.2VDC/1.5VDC/3.0VDC, up to 110VAC/220VAC), the audio signal current generated by the oscillator passes through the electromagnetic coil, causing the electromagnetic coil to generate a magnetic field. Under the interaction of the electromagnetic coil and the magnet, the diaphragm on the outer casing is periodically bridged to emit sound.
The mechanical buzzer is mainly suitable for electric products (boiled eggs, soya-bean milk makers, etc.) to make the warning sounding of electronic products; it is also used for the main components on the repeller. Because it not only emits a frequency of 0.5 kHz but also the entire buzzer is vibrating and can be transmitted to the mouse through the ground to achieve the repeller effect.
Nowadays, mechanical buzzers are generally active. The active mechanical buzzer contains an audio oscillating circuit. When connected to a DC power supply, it can make a “da da da---” sound with a noticeable vibration. For more information about the product here mechanical buzzer sound