Piezo Alarm

Piezo alarm specifications

Piezo alarm knowledge

Piezo alarm is mainly composed of the multivibrator, piezoelectric buzzer, impedance matching and resonance box and shell parts.

It is also possible to mount a light-emitting diode in its housing as required. Multivibrators consist of transistors or integrated circuits. When the AC voltage is added, due to the piezoelectric effect, resulting mechanical deformation stretching and shrinkage, the use of this feature makes the metal plate vibration and make a sound.

In fact, in front of the piezoelectric buzzer has been analyzed in detail the various categories, then the main analysis here in accordance with its feedback method to distinguish between, can be divided into: self-excited feedback buzzer and stimulating No feedback type buzzer. Then when the feedback type buzzer can be positive feedback oscillation circuit will produce a resonant frequency with the same single tone; without feedback type buzzer you can with the external oscillator circuit, choose any frequency to make a sound.

Piezo alarm with small size, high sensitivity, low power consumption, good reliability, low cost features and good frequency characteristics. Therefore, it is widely used in various electrical products alarm, sound use. The most common is music devices, electronic watches, pocket calculators, electronic doorbell and electronic toys and other small electronic devices for the sound components.