Buzzer

2007-07-24 Piezoelectric buzzer

Buzzer interior

Buzzer is a signaling device that is widely used in various applications to produce a buzzing or beeping sound. It is an essential component in many electronic devices, serving as an auditory signaling mechanism. Buzzers can be found in alarm devices, timers, confirmation of user input in computers and other digital devices, and as warning devices in automobiles and household appliances.

Types of Buzzers

There are mainly two types of buzzers: Piezoelectric buzzers and Electromagnetic buzzers.

Piezoelectric Buzzer

A Piezoelectric buzzer operates on the principle of the piezoelectric effect. It uses a piezoelectric material that changes shape or size when an electric voltage is applied, thereby producing sound. These buzzers are known for their clear sound and high volume for their size, making them a popular choice for many applications.

Electromagnetic Buzzer

An Electromagnetic buzzer works on the principle of electromagnetic induction. It consists of an electromagnetic coil and a magnetic circuit that produces sound when an electric current passes through the coil. These buzzers are typically used in applications where a lower tone is required.

Applications of Buzzers

Buzzers are used in a wide range of applications, including:

• Alarm clocks
• Smoke detectors
• Microwave ovens
• Washing machines
• Electronic toys
• Automobiles (e.g., seat belt warning, reverse parking sensors)
• Medical devices (e.g., patient monitors, diagnostic equipment)

Selection Criteria

When selecting a buzzer for a particular application, several factors need to be considered, including:

• Sound output level (measured in decibels, dB)
• Operating voltage
• Frequency range
• Size and mounting style
• Environmental conditions (e.g., temperature, humidity)

Installation and Operation

Installing a buzzer typically involves connecting it to a power source and a control circuit, which activates the buzzer when a specific condition is met. The operation of a buzzer is generally straightforward, requiring minimal maintenance once installed.

Safety Considerations

While buzzers are generally safe to use, it is important to consider the sound level produced to avoid potential hearing damage in applications where users are exposed to the sound for prolonged periods.