Microbuzzer.com · Posted on 18-05-2009 by microbuzzer

Piezoelectric film is the buzz of high pressure after extreme pressure of the piezoelectric ceramic adhesive film on the vibration of sheet metal. When Add AC voltage, it will because the piezoelectric effect, and the generation of mechanical deformation of stretching and shrinkage of the use of This allows the issue of sheet metal vibration and noise.

Way to make the distinction between feedback piezoelectric film is generally divided into buzz-style buzz-chip feedback (self-excited-type) and No feedback-style buzz-chip (external excitation) two. Feedback-type buzz when the film is with feedback oscillator circuit Will generate a cavity resonance frequency and the same tone; without feedback-type films can buzz with External oscillator circuit, select any frequency sound.

Following two piezoelectric film buzz fixed by:

a.
Support the way around – the buzz film diameter fixed on the edge of the resonance cavity, the general non-mining

Feedback-type buzz films, and the buzz-chip with the frequency with cavity will have a higher
The sound pressure output generated by the external oscillator circuit to promote signal to buzzer sounds.

b.
Node to support the way – will buzz with the film fixed in about the same size in diameter ceramic ring
Structure. If properly designed resonator, and with the frequency of the correct type of feedback buzz films

Feedback circuit and is, the larger will be able to generate the sound pressure and the correct frequency.

The above are two ways to be buzz-chip bonded to silica gel in the institutions.

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