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What is a passive buzzer?

Views: 54     Author: Site Editor     Publish Time: 2021-03-05      Origin: Site

The passive piezoelectric buzzer generates sound based on the reaction of the piezoelectric effect. It is the basic principle that pressure change or strain is generated by applying an electric potential on a piezoelectric material. These passive piezo buzzers can be used to warn users of events corresponding to switch actions, counter signals or sensor inputs, as well as being used in alarm circuits. Regardless of the applied voltage changes, the passive piezo buzzer will generate the same noise. Most passive piezo buzzers will produce a sound of 2 to 4 kHz.

What aspects should be paid attention to when using passive buzzers?

What are the characteristics of the passive piezo buzzers?

Can we do a piezo buzzer by ourselves?

Surface Mount Device 3V Passive SMD Piezo Buzzer

What aspects should be paid attention to when using passive buzzers?

As a kind of electronic buzzer, the piezo buzzer can be divided into two major categories: active buzzers and passive buzzers. However, under these two categories, the piezo buzzer has more detailed classification according to its shape and structure. They are widely used in a variety of different electronic equipment. However, during the process of use, the piezo buzzers will be damaged due to wrong operation. So what should be paid attention to when using passive buzzer in life.

First of all, we must start with the installation of the passive buzzer. We shall be careful when using it because of its small size. If there is a lot of dust or stains on the outside of the product, the passive buzzer cannot be wiped with a moist towel or tissue in that it is not a fully enclosed type. If water droplets enter into the passive buzzer during the wiping process, it will cause the passive buzzer to malfunction, or even damage.

When reinforcing the passive piezo buzzer, pay attention not to block the holes on the top of passive piezo buzzer with the tape or other items. This will cause the passive buzzer to produce irregular oscillations, which will affect normal use. At the same time, we should be careful not to have obstacles within 15mm around the passive buzzer, which also will cause irregular oscillations. The reason why the passive buzzer's oscillation required is that it sounds generated by oscillation.

What are the characteristics of the passive piezo buzzers?

When using a buzzer, many people don’t know how to tell active piezo buzzers and passive piezo buzzers. The reason for distinguishing is that they have different generation principles, and the parts used to be matched are also different. The passive buzzer produces sound with the help of external parts, while the active piezo buzzer’s sound is produced by the vibration of its own internal parts without auxiliary parts.

When a passive piezo buzzer is used, its usage scenario can be equivalent to that of a speaker because its generation principle is generated by electromagnetic phenomena, which is the same as the generation principle of a speaker.

When using a passive piezo buzzer, it usually constitutes a complete circuit since that a single passive piezo buzzer cannot be used. In the whole circuit, there will be a triode as a switch, a piezo buzzer as a generating part, a freewheeling diode to ensure the continuous flow of current, and a power supply filter capacitor to filter out the influence of the piezo buzzer on other electronic components.

Although some people think that it is troublesome to use passive piezo buzzers, it is chosen in that its low production cost, and the frequency wider range of the sound it emits, which makes it possible to apply in different places.

Can we do a piezo buzzer by ourselves?

YES. It is really easy for us. Among similar products, piezoelectric buzzers have been popular among the public due to their small size and high sensitivity.

The FIRST step is to prepare an electromagnet. Wind 100 turns of wire on an iron bolt with a length of about 6 cm, leaving 5 cm at the end of the wire as a lead lest the coil from loosing. Use transparent tape to stick the coil on a box. The electromagnetic is well done.

The SECOND step is to prepare shrapnel. When preparing the shrapnel, you need to cut a long iron piece with a width of about 2 cm from the iron can, bend it at a right angle, connect a lead of the electromagnet to the shrapnel, and then use tape to stick the shrapnel on the wooden board.

The THIRD step is to use paper clips as contacts. Put the paper clip up high with a book, stick it firmly with tape, lead out a wire, and connect the circuit.

After completing the above three steps, adjust the distance between the electromagnet and the shrapnel by moving the box, so that the electromagnet can attract the shrapnel. When they can in contact with each other by adjusting the distance, you can listen the sound produced by the piezo buzzer after powering. In this way, the manufacture of the piezoelectric buzzer is completed and we hope you can make a piezo buzzer yourself according to our method steps.

Learning something about passive piezo buzzer can help you know the knowledge of the passive piezo buzzers and even make a piezo buzzer by ourselves. If you want to buy high-quality piezo buzzers with reasonable price, Kailitech Company can provide you with the best products. We also have other piezo buzzers and piezo transducer, having an independent factory and a complete production line. It is our honor if you contact with us.

Copyright  Guangzhou Kailitech Electronics Co. Ltd.


   Silvia Shen
   No. 8th, Jingquan Yi Road, Yonghe Economic Zone, Huangpu, Guangzhou, China