The SFM-27-I Active Beeping Buzzer is a compact and reliable audio alert device designed to generate an automatic intermittent beeping sound when connected directly to a DC power source. Unlike passive buzzers, this active buzzer contains an internal oscillation circuit, eliminating the need for external signal generation or driver circuits. Simply apply power, and the buzzer starts producing a clear warning sound instantly.

With a wide operating voltage range of 3V to 24V DC, this buzzer is suitable for Arduino projects, Raspberry Pi applications, ESP32 systems, industrial control panels, alarm systems, battery-powered devices, security equipment, DIY electronics, automation systems, and electronic warning indicators. Its loud sound output ensures effective notifications in both residential and industrial environments.

Features:

• High-quality SFM-27-I active beeping buzzer

• Built-in oscillation circuit for automatic sound generation

• No external signal or frequency generator required

• Wide operating voltage range from 3V to 24V DC

• Loud intermittent beeping sound output

• Low power consumption design

• Quick response when power is applied

• Compact and lightweight construction

• Easy installation with mounting holes

• Long service life and stable performance

• Suitable for indoor and outdoor electronic projects

• Compatible with Arduino, ESP32, Raspberry Pi, STM32, and microcontrollers

• Reliable audio warning and notification solution

• Durable housing for long-term operation

BDTronics supplies premium-quality electronic components, modules, sensors, and development accessories for students, engineers, hobbyists, and industrial users. The SFM-27 Active Beeping Buzzer is selected for its loud sound output, broad voltage compatibility, and dependable performance in alarm and notification applications.

Specifications:

• Model: SFM-27

• Type: Active Buzzer (Auto-Sound / Beeping)

• Operating Voltage: 3V – 24V DC

• Sound Type: Intermittent Beeping

• Sound Level: ≥ 85 dB at 10 cm

• Current Consumption: ≤ 30 mA

• Operating Frequency: Approximately 3 kHz

• Dimensions: Approx. 30 mm × 15 mm

• Lead Length: Approx. 10 cm

• Operating Temperature: -20°C to +60°C

• Mounting Type: Flanged with Screw Holes

• Polarity: Positive and Negative Leads

How to Use:

• Connect the positive wire to the positive power supply terminal

• Connect the negative wire to ground

• Apply any DC voltage between 3V and 24V

• The buzzer will automatically generate a beeping sound

• Mount the buzzer securely using the built-in screw holes

• Use with relay modules, Arduino outputs, alarm circuits, or industrial controllers

• Disconnect power to stop the sound

Applications:

• Security alarm systems

• Burglar alarms

• Fire alarm circuits

• Arduino projects

• Raspberry Pi projects

• ESP32 and ESP8266 applications

• Battery low-voltage warning systems

• Industrial automation panels

• Electronic notification systems

• Smart home automation

• Equipment fault indication

• Access control systems

• Timer and reminder circuits

• DIY electronics projects

• Educational electronics experiments

• Emergency warning devices

• Vehicle monitoring systems

• Industrial safety equipment

Advantages:

• Plug-and-play operation

• No external oscillator required

• Wide voltage compatibility

• Loud and clear sound output

• Low power consumption

• Easy installation

• Reliable long-term operation

• Compact design for embedded applications

Package Includes:

• 1 × SFM-27 Active Beeping Buzzer (3V-24V DC)

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