Microbuzzer.com · Posted on 17-05-2009 by microbuzzer

Conventional electromagnetic buzzer passive component products

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   Stent Line package   Magnetic ring Plastic Block   Printed Circuit Board   Mo film   Shell

 (1) Preparation of electro-magnet M: about 6 cm in the bolts on the iron ring around the wire 100, line 5 cm for left-side lead, using transparent adhesive tape to stick a good coil, so as not to release the coil, and then it sticky plasters in a box, the solenoid on the well.

(2) Preparation of shrapnel P: from the iron box can cut a width of 2 centimeters long iron, bent at right angles to the electromagnet in the shrapnel of a lead then, the re-use plastic sheets to keep pace with shrapnel in the board .

(3) a paper clip to make contact with Q, use paper clips to elevate the book, with plastic sheets cement, leads to a wire connected circuit in Figure.

(4) regulation of M and the distance between P (through the mobile box), so that electro-magnet to attract shrapnel, regulating contact with the distance between fragments, so that they can just contact with electricity can be heard after the beep sound.

The structure of the principle of buzzer

1. Piezoelectric buzzer mainly Multivibrator, piezoelectric buzz films, impedance matching and a resonance box, shell, etc.. Some shell piezoelectric buzzer is also equipped with light-emitting diodes.

Multivibrator constituted by transistors or integrated circuits. When connected to the power (1.5 ~ 15V DC operating voltage), multi-harmonic oscillator start-up, output of 1.5 ~ 2.5kHZ audio signal, impedance matching device to promote film piezoelectric audible beep.

Piezoelectric film by buzz or niobium lead zirconate titanate piezoelectric ceramics of lead acid magnesium materials. Ceramic films on the silver-plated electrodes on both sides, by the polarization and aging treatment, with brass or stainless steel sheet film together.

2. Electromagnetic  buzzer by the oscillator, the electromagnetic coil, magnet, vibration, such as the composition of membrane and shell.

Access to power, the audio signal generated by oscillator current through the electromagnetic coil to generate magnetic fields of electromagnetic coils. Membrane vibration in the electromagnetic interaction between the coil and magnet, the vibration of vocal periodically.

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