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Views:61 Author:Site Editor Publish Time: 2019-08-05 Origin:Site
The piezo buzzers use piezoelectric materials. Piezoelectric materials create electricity when stress is applied, and become stressed when electricity is applied.
The piezo element is to stick the piezoelectric material on the metal sheet. When an alternating voltage is applied to the piezoceramic element, the buzzer will mechanically deform and sound due to the inverse piezoelectric effect.
Working principle of Magnetic buzzer
The magnetic buzzer uses the action of the coil on the buzzer to sound.
The magnetic buzzer is mainly composed of an oscillator, a coil, a magnet, a vibrating disk and a casing. After the power is turned on, the audio signal current generated by the oscillator passes through the electromagnetic coil, so that the electromagnetic coil generates a magnetic field. The vibrating disk periodically vibrates the sound under the interaction of the electromagnetic coil and the magnet.
Which buzzer best fits your application?
In choosing a buzzer it’s important to consider both the electrical and physical parameters required. Aside from frequency and SPL, the operating voltage, current draw, and resonant frequency are all key factors when choosing between a piezo and magnetic buzzer.
| Piezo buzzer | Magnetic buzzer | |
| Method of Operation | Piezoelectric Effect | Electromagnetic Effect |
| Size | Big(7-50mm) | Small(4-25mm) |
| Resonant Frequency | High(1-6khz) | Low(1-3khz) |
| Operating Voltage | High(3-250v) | Low(1.5-12v) |
| SPL | Louder(85-120db) | Lower(70-95db) |
| Current Consumption | Low(1-35mA) | High(20-120mA) |
Wide operating voltage
Lower current consumption
Higher rated frequency
Larger footprint
Higher sound pressure leve
Narrow operating voltage
Higher current consumption
Lower rated frequency
Smaller footprint
Lower sound pressure level
The piezo buzzers’ structure is simple, but the sound is larger, which is used for equipment such as alarms. The magnetic buzzer is cheaper, mostly used in household appliance, remote controlled, motherboard and timers etc.
