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5V Active Electromagnetic TMB12A05 "Goli" Buzzer – High-Decibel Constant Tone Alarm for Arduino & IoT

Specification	Details
Operating Voltage	3V to 7V DC (5V Nominal)
Resonant Frequency	2400Hz ± 300Hz
Sound Output	≥85dB at 10cm
Current Consumption	~25mA
Dimensions	12mm (Diameter) x 9.5mm (Height)
Pin Spacing	7.6mm (Breadboard Friendly)
Housing Material	Black PBT Plastic

Price

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₹ 12.71

(Tax included)

Barcode: 2211221

Product Description

The TMB12A05 Buzzer is engineered for high-pitched, clear audible notification. It utilizes electromagnetic technology, where an internal coil drives a metal diaphragm to generate sound. Because it is an "Active" type, it does not require a complex square-wave signal from a microcontroller to work; simply connecting it to a 5V power source is enough to trigger a constant beep. The module is housed in a durable, miniature casing that fits easily on PCBs and breadboards, featuring a protective label on the sound hole that should be removed after soldering for maximum volume.

Key Features

Built-in Oscillator: Generates its own 2400Hz signal, requiring only a simple High/Low digital signal to turn on and off.
High Sound Pressure: Delivers over 85dB, making it loud enough to be heard clearly in noisy indoor environments.
Low Power Requirement: Draws only 25mA, which is safe to power directly from a digital pin on most microcontrollers like Arduino.
Reliable Construction: Encapsulated in heat-resistant PBT plastic to withstand wave soldering temperatures.
Compact Footprint: The 12mm "Goli" size is small enough to fit into handheld devices and compact project boxes.

Technical Details

Signal Type: Continuous Beep.
Mounting: Through-hole (PCB Mount).
Weight: Approx. 2 grams.

Prototyping and Engineering Tips from Robogears

Active vs. Passive Identification: To check if your buzzer is active, connect it to a 1.5V or 9V battery. If it makes a sound immediately, it is Active. If it only clicks once, it is Passive and requires a PWM signal to make music.
Polarity Matters: These buzzers are polarized. The longer pin (or the side marked with a '+') must be connected to the positive voltage, and the shorter pin to Ground. Reversing the polarity may result in no sound or damage to the internal oscillator.
The "Loudness" Sticker: These buzzers ship with a yellow/white sticker covering the sound hole. This is to prevent flux and cleaning fluids from entering the buzzer during industrial manufacturing. For your prototype, peel the sticker off to unlock the full 85dB volume.
Transistor Switching: While an Arduino pin can drive one buzzer (~25mA), if you are building a system with multiple buzzers or long wires, use a simple NPN transistor (like BC547) to switch the buzzer. This protects your microcontroller from inductive spikes and ensures maximum volume.

Package Includes

1 x 5V Active Electromagnetic TMB12A05 Buzzer

Disclaimer

Continuous operation at high voltages (above 7V) for extended periods may cause the internal coil to overheat. Ensure correct polarity to maintain the lifespan of the internal circuit.