3V DC Mini PCB Mount Active Buzzer | Pro Tronix

Product Description

The 3V DC Mini PCB Mount Active Buzzer is an ultra-compact, energy-efficient audio signaling device engineered for space-constrained low-voltage electronics. Featuring an integrated internal oscillator driver, this mini active buzzer produces a clear, continuous acoustic tone automatically upon applying a 3V DC power source—eliminating the need for complex microcontroller software code or external timer circuitry.

Designed with standard 2.54 mm pin spacing in a miniature low-profile footprint, it plugs directly into solderless breadboards, PCB prototype boards, and compact enclosures. Operating on voltages as low as 2V DC up to 4V DC with minimal current draw, it is specifically optimized for 3.3V logic microcontrollers (such as ESP32, STM32, and Raspberry Pi Pico) and lithium or coin-cell battery-powered devices. Housed in a durable sealed plastic casing, it provides reliable audio alerts, button-press feedback, and alarm signals for modern portable electronics.

⚠️ Polarity & Supply Voltage Tip: This active mini buzzer is polarized. Connect the longer pin (or the terminal marked with a “+” symbol on the top protective film) to your positive supply rail or MCU digital pin, and the shorter pin to Ground (GND). Do not apply voltages exceeding 5V DC directly to this 3V mini variant to avoid damaging the internal driver or distorting the tone. Remove the top protective sticker after soldering for maximum sound clarity.

Technical & Architectural Highlights

This ultra-miniature active buzzer provides clean audio signaling in tight spaces:

• Internal Driver Circuitry: Emits a continuous acoustic tone automatically when powered with 3V DC—no PWM or frequency generation code required.

• 3.3V Logic & Battery Optimized: Native support for 3V/3.3V logic platforms (ESP32, STM32, LiPo/Coin cell batteries) without requiring voltage level shifters.

• Compact Mini Footprint: Ultra-small diameter and height designed for high-density PCB layouts and portable devices.

• Breadboard-Friendly Pin Spacing: Standard 2.54 mm pin pitch for effortless prototyping on solderless breadboards.

🧰 Prototyping & Audio Setup (Recommended Bundle)

Building portable alarm nodes, 3.3V microcontroller alerts, or compact battery-powered timers? Make sure you add these essential components to your cart to complete your project setup:

1. 8 Ohm Mini Speakers & Buzzers: Looking for multi-frequency music or voice playback in addition to mini buzzers? Check out our audio speaker selection: Pro Tronix Mini Speakers & Audio Components

2. Solderless Breadboard: The essential foundation for wiring mini buzzers, microcontrollers, and sensors without soldering: Pro Tronix Breadboards Collection

3. Jumper Wires & Cables: High-quality male-to-male and male-to-female wire packs to route signals between the buzzer pins, microcontrollers, and power rails: Pro Tronix Wires & Cables Collection

4. General Purpose NPN Transistors (2N2222 / BC547): Recommended for driving the buzzer when switching higher current loads or interfacing with low-current GPIO pins.

5. Resistor Assortment (1/4W Metal Film): Required for base current limiting when using transistor drivers.

Polarized Pinout & Connection Summary

Applications

• Low-Power IoT Nodes: Audible status indicators for battery-powered ESP32, ESP8266, and STM32 sensors.

• Portable Handheld Devices: Button-press feedback and power-on tones for compact electronic handhelds.

• Compact Alarm Systems: Low-voltage door contact warnings, leak detectors, and mini timer alerts.

• Wearable Electronics: Space-saving audio notifications powered by 3V coin cell (CR2032) or LiPo batteries.

Technical Specifications

What’s in the Box

• 1 x 3V DC Mini Active PCB Mount Buzzer.

Everything you need for your next project is now available with guaranteed quality and fast shipping across Egypt.. Order now from Pro Tronix!