Shenghui Electronic

A passive piezo buzzer is an electronic component that utilizes the piezoelectric effect to generate sound. This effect is a characteristic of certain materials, such as quartz and certain ceramics, which can generate an electric charge in response to applied mechanical stress. Conversely, these materials can also vibrate when an electric field is applied across them, making them suitable for use as sound-producing devices.

How it Works:When a voltage is applied to a passive piezo buzzer, the piezoelectric material within the buzzer deforms slightly, which causes it to vibrate and produce sound. The frequency of the sound produced is directly related to the frequency of the voltage applied to the buzzer. Unlike active buzzers, which have an internal oscillator to generate sound from a constant voltage source, passive buzzers require an external source of varying voltage to produce sound.

Key Characteristics:

1. Low Power Consumption: Passive piezo buzzers are known for their low power consumption, making them ideal for battery-operated devices.

2. Small Size and Lightweight: They are compact and lightweight, which makes them suitable for a wide range of applications where space is at a premium.

3. Versatility: Passive piezo buzzers can produce a variety of sounds and tones by adjusting the frequency of the applied voltage.

4. Durability: These buzzers are reliable and have a long lifespan, with fewer moving parts compared to electromagnetic buzzers.

5. Wide Frequency Range: They are available in a range of frequencies, including audible and ultrasonic, which allows them to be used in diverse applications.

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Applications:Passive piezo buzzers are used in various applications due to their ability to produce audible signals efficiently. Some common uses include:

• Alarms and Warning Devices: They are used in smoke, gas, and water alarms, as well as industrial security systems to provide audible alerts.

• Home Appliances: In appliances such as air humidifiers, washing machines, and alarm clocks for notification and alerting purposes.

• Automotive Alarms: They serve as audio components in vehicle security systems and dashboard audio.

• Haptic Feedback: In devices that require tactile feedback, such as some types of controllers or mobile phones.

• Healthcare Systems: Used in various healthcare equipment for alerts and notifications .

Technical Specifications:Passive piezo buzzers can have different specifications depending on the model and manufacturer. Some common specifications include:

• Sound Pressure Level (SPL): The sound pressure level output depends on the voltage applied and the frequency of excitation, with the highest SPL occurring at the resonant frequency of the buzzer.

• Operating Voltage: The buzzer operates within a specific voltage range, typically from 3V to 12V, with the exact voltage depending on the model.

• Resonant Frequency: This is the frequency at which the buzzer produces the maximum sound pressure level.

In summary, a passive piezo buzzer is a versatile and efficient device that converts electrical signals into sound. Its low power consumption, small size, and ability to produce a range of tones make it a popular choice for many electronic devices and applications. Shenghui Electronics, as a manufacturer, likely offers a variety of passive piezo buzzers with different specifications to meet the needs of diverse applications.