SFM-20B Active Piezo Buzzer DC 3–24V Alarm Speaker for Arduino
SFM-20B Active Piezo Buzzer DC 3–24V Alarm Speaker for Arduino
SFM-20B High-Decibel Active Piezo Buzzer – DC 3–24V Continuous Tone
The SFM-20B Active Piezoelectric Buzzer delivers a powerful, continuous-tone alarm signal across a wide 3–24V DC operating range. Whether you're building an Arduino alert system, a DIY security device, or any electronics project that needs a reliable audible indicator, this compact buzzer is ready to perform straight out of the box — no external oscillator required.
Key Features
- Active buzzer design – produces a continuous sound with a direct DC voltage; no additional signal generation needed
- Wide voltage range – operates on DC 3V to 24V, compatible with Arduino, Raspberry Pi, and most microcontroller projects
- Piezoelectric technology – highly durable, low power consumption, and long operational life
- High decibel output – loud, penetrating alarm tone ideal for alerts, notifications, and security applications
- Model SFM-20B – compact form factor for easy PCB mounting or breadboard prototyping
- Available in multipacks – choose from 1 to 10 pieces to suit your project needs or stock your workshop
- Versatile use – suitable for alarms, timers, doorbells, electronic toys, and automation circuits
Specifications
- Model: SFM-20B
- Type: Active Piezoelectric Buzzer / Speaker
- Operating Voltage: DC 3V – 24V
- Sound Type: Continuous tone
- Compatible With: Arduino, Raspberry Pi, general microcontroller boards
- Quantity Options: 1, 2, 3, 5, or 10 PCS
- Country of Origin: Made in Mainland China
Perfect For
- Arduino and microcontroller alarm/notification circuits
- DIY home security and alert systems
- Electronic timers and counters
- Robotics projects requiring audible feedback
- Educational electronics kits and prototyping
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Frequently Asked Questions
Q: What is the difference between an active and passive piezo buzzer?
A: An active buzzer like the SFM-20B has a built-in oscillator circuit, so it produces sound when you simply apply DC voltage — no additional signal is needed from your microcontroller. A passive buzzer requires an external PWM signal to generate sound. This makes the SFM-20B much easier to use in Arduino and beginner electronics projects.
Q: Is the SFM-20B compatible with Arduino and Raspberry Pi?
A: Yes. The SFM-20B operates over a wide DC voltage range of 3V to 24V, making it fully compatible with Arduino (5V), Raspberry Pi (3.3V/5V), ESP32, and virtually any other microcontroller or development board. Simply connect the positive lead to a digital output pin and the negative lead to ground.
Q: How loud is the SFM-20B buzzer?
A: The SFM-20B is rated as a high-decibel active buzzer, producing a clear and strong continuous tone well-suited for alarms, notifications, and audible indicators in both indoor and light outdoor environments. The actual volume will vary slightly depending on the supply voltage used.
Q: Can I order multiple units at once?
A: Absolutely. This listing offers quantity options ranging from 1 to 10 pieces (1, 2, 3, 5, or 10 PCS), making it convenient to stock up for larger projects, classroom kits, or professional prototyping work.