Microbuzzer.com · Posted on 15-05-2009 by microbuzzer

Passive electromagnetic and piezoelectric buzzer  to install passive

Buzz passive electromagnetic inductive load devices are the ideal square wave input is usually recorded as being: VO-P.

Buzz passive pressure load is capacitive devices, the ideal square wave input is usually recorded as two-way: VP-P.

However, if the IC is the reverse, such as device 4049, from a non-door buzzer access input and output is also very desirable, but sometimes too small output power IC, the sound falls short of expectations.

If the buzzer is used as a loud alarm pressure, and two ordinary pin inductance also can not meet the requirements of the general three-tap inductor will generally boost for more than 10 times, and some shouted pressure may take more than 110dB to achieve low-power step-up transformer.

Active and passive buzzer  What is the difference?

Buzzer buzzer active and passive product of the fundamental difference between the requirements of the input signal is different;

The ideal of active work buzzer DC signal is usually marked as VDC, VDD, etc.. Buzzer because there are a simple oscillator circuit, the DC can be converted into a constant frequency pulse signal, from the surface is the alternating magnetic field, driven vibration pronunciation molybdenum films. However, in some active buzzer signal in a particular exchange for being able to work, only the exchange of signals in high voltage and frequency requirements, such work will not be adopted in general.

No internal passive buzzer drive circuit, and some companies and factories as the hearing, GB device called an audible. Passive buzzer signals the work of the ideal square wave. If the DC signal to the buzzer in advance is not to respond, because the magnetic circuit of a constant vibration of Mo films can not pronounce.

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