Active Buzzer

Key Features

• Built-in Oscillator: Produces sound automatically when power is applied.

• Simple Operation: Just connect to DC voltage (e.g., 3V–5V).

• Stable Tone Output: Fixed-frequency beep, typically 2 kHz–4 kHz.

• Compact & Lightweight: Fits easily into small devices and enclosures.

• Long Service Life: Durable piezoelectric element with reliable performance.

• Low Power Consumption: Suitable for battery-powered circuits.

Technical Specifications (Typical)

• Type: Active Piezoelectric Buzzer

• Operating Voltage: 3V – 12V DC (most common: 5V)

• Current Consumption: 15–30 mA

• Sound Pressure Level: 85–100 dB at 10 cm

• Resonant Frequency: ~2.7 kHz (varies by model)

• Diameter: 10 mm – 12 mm (common sizes)

• Mounting: PCB pin-type (two-pin)

• Polarity:

  • Positive (+) — often marked with “+” or longer leg

  • Negative (–)

Applications

• Security alarms

• Timers and reminder devices

• Household appliances

• Toys and gadgets

• Indicator or warning signals

• Robotics and embedded systems

How It Works

The active buzzer’s internal oscillator generates a signal that vibrates the piezo element, producing a beeping tone. Powering it with DC voltage activates the internal circuit automatically—no PWM, no audio signal, no additional components.