GY-MAX4466 Electret Microphone Amplifier Sensor Sound Module with Adjustable Gain Control for Arduino

Give your project a sense of hearing with this high-quality electret microphone amplifier module. This compact, fully assembled board features a 20Hz–20kHz electret microphone and is powered by the Maxim MAX4466 op-amp — a chip specifically designed for audio amplification. It delivers excellent performance with low noise and strong power supply rejection, resulting in cleaner, clearer audio than many other mic amps we've tested.

This module is ideal for voice changers, audio sampling, recording, and sound-reactive applications such as FFT visualizations. A small trimmer potentiometer on the back allows you to fine-tune the gain between 25x and 125x. At typical speaking volume (around 6 inches away), you'll get around 200mV peak-to-peak, which is suitable for line-level inputs, or up to 1V peak-to-peak, perfect for feeding into a microcontroller's analog input without clipping. The rail-to-rail output means the signal can swing all the way up to 5V peak-to-peak if needed.

Using the module is easy:

• Connect GND to ground.
• Connect VCC to 2.4–5V (for best results, use a clean supply — e.g., the 3.3V line on your microcontroller).
• The OUT pin provides the audio waveform.

The output includes a DC bias at VCC/2, so when there's no sound, it sits at that midpoint voltage. If your audio equipment expects AC-coupled input, simply place a 100µF capacitor between the OUT pin and your device. This capacitor isn't needed if you're using a differential amplifier input or the target device already has AC coupling.

Note: The module’s output isn’t designed to drive speakers or more than tiny in-ear headphones directly. If you want to output to speakers, use an external audio amplifier (such as a 3.7W stereo amp). If you're connecting it to a microcontroller, no additional amplifier or capacitor is required — just hook the OUT pin to an analog input and you're good to go.

 Technical Specifications