Microbuzzer.com · Posted on 06-08-2010 by microbuzzer

Distinguish between active and passive buzzer

On the market because of their small size, a small buzzer (diameter only llmm), light weight, low price, solid structure, and is widely used in electrical equipment needs sound, electronic production and microcontroller circuits, etc. . From the exterior view, both the buzzer as the same, but a closer look, both height slightly.

Buzzer schematic difference, active buzzer a, height of 9mm, while the passive buzzer b the height of 8mm. If the county upwards of two buzzer pin placement, you can see the green circuit board is a passive buzzer, no circuit boards closed with a vinyl one is active buzzer .

Into further determine active and passive  buzzer, but also resistance with a multimeter test file Rxl file: buzzer with a black sheet document access “,” pin, red table pen back and forth to touch the other pins, if triggered the cracking, cracking sound and the resistance only 8Ω (or 16Ω) is passive buzzer; if given continuous sound, and the resistance of a few hundred more than in Europe, is active buzzer. Buzzer directly connected to the rated active power (new buzzer has stated on the label) can be a continuous sound; and passive electromagnetic buzzer and the speaker is, like, need access to the audio output circuit voice.

Buzzer is an integrated structure of electronic messages ringers, widely used in computers, printers, copiers, alarm, electronic toys, automobile electronic equipment, telephones, timers and other electronic products for sound devices; buzzer consists of piezoelectric buzzer and two types of electromagnetic buzzer. Piezo buzzer mainly by multi-harmonic oscillator, piezoelectric buzzer, impedance matching device and the resonance box, shell and other components. Multivibrator constituted by the transistor or integrated circuit, when powered on (1.5 ~ 15V DC working voltage), multi-harmonic oscillator start-up, output 1.5 ~ 2.5kHZ audio signal, impedance matching device to promote the piezoelectric buzzer voice.

Magnetic buzzer by the oscillator, the electromagnetic coil, magnet, vibration diaphragm and shell and other components. When powered on, the audio oscillator signal current through the electromagnetic coil, electromagnetic coil creates a magnetic field, vibration, electromagnetic coils and magnets in membrane interaction, the periodically vibrating voice.

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