Working Principle of Piezo buzzer

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 Characteristics

• Wide operating voltage

• Lower current consumption

• Higher rated frequency

• Larger footprint

• Higher sound pressure leve

  
  
  
  
  

Magnetic Buzzer Characteristics

• 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.