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How to Repair a Piezoelectric Buzzer 

The piezoelectric buzzer is an acoustic body that uses piezoelectric ceramics as an electroacoustic transducer. The core of this device is a transducer that is a thin sheet of piezoelectric ceramics pasted onto a metal sheet, i.e., a piezoelectric buzzer. The piezoelectric buzzer is mainly composed of a multi-harmonic oscillator, a piezoelectric buzzer, an impedance matcher, a resonance box, and a housing. There are piezoelectric active buzzers and piezoelectric transducers. Piezoelectric buzzers have the following features.

The piezoelectric buzzer does not produce flying arcs or RF noise, nor does it cause large vibrations due to looseness.

The piezoelectric buzzer can emit a variety of dynamic sounds and analog and intermittent sounds. The sound color is pure and not easily covered by noise.

The piezoelectric buzzer is easy to install and has no electromagnetic coils or moving coils, so you don’t have to worry about insulation deterioration and there is no possibility of electricity going away.

Piezoelectric buzzer current is small, generally below 20ma, will not exceed 100ma.

Piezoelectric buzzers are very popular because of their advantages. But when the piezoelectric buzzer will be damaged in the process of application and there is no suitable replacement piezoelectric buzzer, how do we repair it?

The piezoelectric buzzer is mainly composed of a piezoelectric ceramic chip, a step-down circuit, an oscillation circuit, a sound-assisting cavity, and a lead wire. It is the exercise of the electronic oscillation circuit generated by the alternating voltage on the piezoelectric ceramic chip, so that the piezoelectric ceramic chip vibration, and then through the resonance of the helper cavity and emit a loud and clear buzzing sound.

So any piece of the circuit to produce a fault will certainly lead to the buzzer does not sound and so on.

The general cause is the buck resistor breakdown damage; triode or integrated circuit damage; piezoelectric ceramic chip lead breakage.

Then we need to use a multimeter to search all-clear before the real start of the repair, to see whether the lead has been broken, if not broken to start the test, and vice versa, it needs to be connected from the new good.

Next is to start checking the circuit inside, for example, if the load is found to be damaged, we need to replace the components of the same specification and model at this time.

Because the piezoelectric buzzer is usually sealed components in a plastic shell, so before repair, we need to use a knife to pry open its shell, of course, after repair, but also with glue for a new seal, do so mainly to prevent electronic components from moisture.

So the above are the solutions to some problems in the use of piezoelectric buzzers. When you encounter similar problems in use, you can refer to these solutions.