FEATURES – ACTIVE BUZZER 12V (NO PCB)

• Type: Active buzzer with internal oscillator.
• Material: PBT plastic.
• Color: Black.
• Rated voltage: 12 V DC.
• Operating voltage range: 9 V – 15 V.
• Sound pressure level: 85 dB at 10 cm.
• Operating temperature: -20 °C to +70 °C.
• Weight: Approx. 2 g.
• Connection: 2 pins (positive and negative).

This 12V active buzzer produces a loud and constant tone thanks to its built-in oscillator. It only requires DC voltage to operate, making it ideal for alarms, notifications, and industrial signaling systems.

WHAT IS AN ACTIVE BUZZER?

An active buzzer is an electromechanical device that generates sound as soon as voltage is applied. Unlike a passive buzzer, it does not require PWM or external frequency generation — the tone is built in.

Because of this, it is reliable, easy to use and widely employed in both consumer and industrial devices.

DIFFERENCE BETWEEN ACTIVE AND PASSIVE BUZZERS

• Active buzzer: produces a fixed tone when powered. No PWM required.
• Passive buzzer: works like a small speaker; needs PWM to create tones or melodies.

For alert or warning systems, the active buzzer is the recommended choice.

USES & APPLICATIONS

• Security alarms (home, shops, warehouses).
• Warning and alert systems.
• Industrial automation equipment.
• Machinery indicators and fault beepers.
• Electronic notification devices.
• DIY projects requiring a strong audible alert.
• Electronic toys and sound modules.

HOW TO USE A 12V ACTIVE BUZZER

Important: This buzzer must NOT be connected directly to Arduino, ESP32 or Micro:bit. These boards operate at 3.3–5 V and cannot provide the required current or voltage.

To control it safely, use a NPN transistor and a 12V power supply. Typical wiring:

1. Connect the buzzer’s positive pin to +12V.
2. Connect the negative pin to the collector of an NPN transistor.
3. Connect the emitter of the transistor to GND.
4. Drive the transistor’s base using a microcontroller pin through a ~1 kΩ resistor.

This allows the buzzer to be turned on/off using digitalWrite(HIGH/LOW) while protecting your controller.

IMPORTANT CONSIDERATIONS

• Requires a stable 12V DC supply.
• Produces a loud 85 dB tone — suitable for alarms.
• Only outputs a fixed tone (no melodies).
• Must be controlled with a transistor when used with 3.3–5 V microcontrollers.
• Do not use near the ear or in enclosed spaces.
• Verify polarity before powering the device.

FAQ – FREQUENTLY ASKED QUESTIONS

Does this buzzer work when directly powered with 12V?
Yes. Being an active buzzer, it emits sound as soon as the voltage is applied.

Can I connect it directly to Arduino?
No. Arduino works at 5V and cannot drive a 12V buzzer. Use a transistor and external power supply.

Does it produce a fixed tone?
Yes. It cannot generate melodies or variable tones.

Is it suitable for alarm systems?
✔️ Yes. It is designed for warning signals and industrial notification.

Is it louder than a passive buzzer?
Yes. This model reaches 85 dB at just 10 cm.

A powerful 12V active buzzer ideal for alarms, alerts and industrial sound signaling.