Piezo Buzzer manufacturers

what is piezo buzzer

A piezo buzzer is an electronic audio signaling device that produces sound using the piezoelectric effect. The piezoelectric effect refers to the ability of certain materials to generate an electrical charge in response to applied mechanical stress or pressure. In the case of a piezo buzzer, a piezoelectric ceramic element is used, which deforms when a voltage is applied to it, creating sound waves.

Piezo buzzers are commonly used in various electronic devices and applications as an alert or alarm mechanism. They are known for their simplicity, compact size, low power consumption, and durability. Piezo buzzers can produce a wide range of tones and frequencies, typically in the audible range for human hearing.

To generate sound, a piezo buzzer requires an alternating current (AC) signal at its resonant frequency. When the AC voltage is applied, the piezoelectric element rapidly expands and contracts, causing the surrounding air to vibrate and produce sound waves. The frequency of the sound produced depends on the AC signal's frequency, and the volume can be adjusted by varying the voltage or current supplied to the buzzer.

Piezo buzzers are commonly used in devices such as alarm clocks, timers, security systems, appliances, medical devices, and various electronic gadgets where a compact and reliable sound alert is required. They are often preferred over other types of audio transducers due to their simplicity, cost-effectiveness, and ability to operate in harsh environments.

The basic structure of a piezo buzzer consists of a piezoelectric ceramic element, a diaphragm, and a housing.

    Piezoelectric Ceramic Element: The main component of a piezo buzzer is a piezoelectric ceramic disc or plate. This ceramic material is typically made of a ferroelectric material like lead zirconate titanate (PZT). When a voltage is applied to the piezoelectric material, it deforms and generates mechanical vibrations.

    Diaphragm: The piezoelectric ceramic element is bonded to a diaphragm, which is a thin, flexible membrane typically made of metal or plastic. The diaphragm acts as a mechanical amplifier for the vibrations generated by the piezoelectric element. When the piezoelectric element deforms, it causes the diaphragm to vibrate, which, in turn, produces sound waves.

    Housing: The piezo buzzer is enclosed in a housing or casing that protects the internal components and helps direct and amplify the sound output. The housing is usually made of plastic or metal and may have openings or vents to allow sound to propagate.

When an alternating current (AC) signal is applied to the piezoelectric ceramic element, it undergoes rapid expansion and contraction, causing the attached diaphragm to vibrate. The vibrations of the diaphragm generate sound waves in the surrounding air, producing the audible tone or sound produced by the piezo buzzer.

The frequency of the sound produced by a piezo buzzer is determined by the AC signal's frequency, while the volume can be adjusted by varying the voltage or current supplied to the buzzer. Piezo buzzers are known for their simplicity, compact size, low power consumption, and durability, making them widely used in various electronic devices and applications as an alert or alarm mechanism.