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

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.