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Easy To Use Small Passive Buzzer In Musical Instruments

  • FBPT3010


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The passive buzzer utilizes electromagnetic induction to attract or repel the electromagnet formed by the voice coil connected to alternating current and push the diaphragm to produce sound. Connecting direct current can only continuously push the diaphragm and cannot produce sound, and can only produce sound when connected or disconnected.

The working principle of a passive buzzer is the same as that of a speaker.

When using a square wave signal source to drive, a diode should be connected in reverse parallel to prevent the high-voltage reverse electromotive force generated in case of sudden power outage from penetrating other components and shortening the service life.

Active buzzers are often more expensive than passive ones because there are multiple oscillation circuits inside, and only DC power at the rated voltage needs to be connected to produce a specified frequency of sound. The frequency is determined by the internal oscillation circuit and cannot be changed.

piezo buzzer FBPT3010

The working principle of a passive separately excited buzzer is that the square wave signal is input into a resonant device and converted into a sound signal output。


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