SFM380 Active Piezoelectric Buzzer 12V/24V DC Car Speaker

SFM380 Active Piezoelectric Buzzer – 12V & 24V DC Continuous Tone Speaker

The SFM380 Active Buzzer (Model AT3040) is a rugged, reliable piezoelectric DC speaker designed for automotive and electronics applications. Whether you need a steady alarm tone for a vehicle reversing system, an industrial alert, or a DIY electronics project, this compact buzzer delivers a clear, continuous sound signal at both 12V and 24V DC operating voltages.

Key Features

• Dual Voltage Compatibility: Operates at 12V and 24V DC – suitable for cars, trucks, and a wide range of electronic circuits.
• Active Piezoelectric Design: Built-in oscillator circuit means it produces continuous sound as soon as power is applied – no external signal generator needed.
• Car-Dedicated Construction: Engineered to meet automotive-grade durability demands, making it ideal for vehicle alarm systems, reverse warning tones, and dashboard alert circuits.
• Compact & Lightweight: Easy to mount in tight spaces without adding bulk to your build.
• Wide Application Range: Suitable for automotive projects, industrial machinery alerts, DIY electronics, home automation systems, and more.
• Simple Wiring: Straightforward two-wire connection for fast, hassle-free installation.

Specifications

Who Is This For?

This buzzer is perfect for automotive enthusiasts, electronics hobbyists, engineers, and DIY makers who need a dependable, plug-and-play audible alert component. It works seamlessly in car alarm circuits, parking sensor systems, industrial control panels, and custom electronics projects.

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Frequently Asked Questions

Q: What is the difference between an active buzzer and a passive buzzer?

A: An active buzzer like the SFM380 contains a built-in oscillator circuit, so it generates its own continuous sound tone as soon as DC power is applied — no external frequency signal is required. A passive buzzer, by contrast, needs an external AC or PWM signal to produce sound, giving you more control over pitch but requiring additional circuitry.

Q: Can this buzzer be used in both 12V car systems and 24V truck systems?

A: Yes! The SFM380 active piezoelectric buzzer is rated for both 12V and 24V DC operating voltages, making it compatible with standard passenger car electrical systems as well as heavier 24V truck and commercial vehicle systems.

Q: Is this buzzer easy to install in a DIY electronics project?

A: Absolutely. The active buzzer uses a simple two-wire connection — connect positive and negative leads to your DC power source and the buzzer will immediately begin producing a continuous alert tone. No additional drivers or signal generators are needed, making it ideal for beginners and experienced makers alike.