Views: 76 Author: Site Editor Publish Time: 2021-11-03 Origin: Site
The buzzer, also known as the sounder, is a miniaturized electro-acoustic device, which working principle can be divided into two types: piezoelectric buzzers and electromagnetic buzzers. Each type has specific characteristics. Generally speaking, the piezo buzzers are of higher reliability, lower power consumption and higher sound pressure level.
How many types of buzzers are there?
What are the applications of piezo buzzers?
The piezo buzzer is made of piezoelectric element, which is made of piezo ceramic technology. It is necessary to plate electrodes on both sides of the piezo ceramic element, which is mainly used for energizing and supplying the piezoelectric buzzer. Piezo buzzer’s sound needs to vibrate back and forth through a piezoelectric element, so we need to use square wave signal data to drive, which requires a higher driving system voltage to get a higher sound.
Comparing to piezo buzzer, magnetic buzzer works under lower rated frequency and higher current consumption, while piezo buzzer’s maximum sound pressure level capability is usually higher than that of an magnetic buzzer. In an magnetic buzzer, current is driven through a coil to generate a magnetic field. When the current exists, the flexible magnetic disk is attracted by the coil. When the current does not flow through the coil, the flexible magnetic disk returns to the "rest" position. The sound produced by the magnetic buzzer is produced by the movement of the ferromagnetic disk in a similar way to the way the cone in the speaker produces sound.
As to the category of the piezo buzzers, they can also be subdivided into the other two parts: active piezo buzzers and passive piezo buzzers. The working principle of passive buzzer is the same as that of speaker with low cost but wider range of sound frequency. A passive buzzer does not have the driving curcut built-in, offering a greater range of flexibility when designing circuit. A passive buzzer requires AC signal to make a sound, and is usually called 'Transducer' instead of 'Buzzer'.
Most passive piezo buzzers produce sound at given frequency of 2 to 4 kHz, which is most easily heard. While active piezo buzzers have the driving circuity built into the design, and run on DC, and usually operate on a fixed frequency and are called “Indicators” as well.
A piezo buzzer is a type of electronic device which is used to produce a tone, alarm or sound. It is widely used in household appliances, in the alarm systems of banks and public security, and in electronic toys and game consoles. The piezo buzzer is mainly used for idicating or alarming purposes. Depending on the design and purpose, it can emit various sounds such as music, siren, buzzer, alarm, and electric bell. For example, the piezo buzzer used in the washing machine often buzzes to remind the user of the operation process. Most piezo buzzers used in household appliances are for indication or alert. As the doorbell application, the piezo buzzer often emits "ding dong" or music to remind guests to visit. The piezo buzzers installed in public security, bank, and home guard areas often sound if someone enters the guard zone under the action of sensor control.
Learning something about magnetic buzzers and piezo buzzers can help you know there are many types of the buzzers and application of each buzzer.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. We sincerely invite customers and friends to visit Kailitech for professional guidance. Choosing Kailitech will make you greater success.