GY-MAX4466 Electret Microphone

20-20KHz with Adjustable Gain

Add an ear to your project with this Electret microphone amplifier. This fully assembled and tested board comes with a 20-20KHz electret microphone soldered on. Amplification uses the Maxim MAX4466 op-amp specifically designed audio application.

The amplifier has excellent power supply noise rejection, so this amplifier sounds really good and isn't nearly as noisy or scratchy as other mic amp solutions.

The sensitive microphone module is great for use with projects such as voice changers, audio recording, sampling, and audio-reactive projects that use FFT.

Onboard there is a trimmer pot on the back of the board to adjust the gain, from 25x to 125x. That's down to be about 200mVpp (for normal speaking volume about 6-inch away). Good for attaching to devices that expect 'line level' input without clipping, or up to about 1Vpp. Ideal for reading from a microcontroller ADC. The output is rail-to-rail so if the sounds become too loud, the output can go up to 5Vpp!

Usage:

Connect GND to Ground, VCC to 2.4-5VDC. For best performance, use the "quietest" power supply available (on an Arduino, this would be the 3.3V supply).

The audio waveform will come out of the OUT pin. The output will have a DC bias of VCC/2 so when it's perfectly quiet, the voltage will be a steady VCC/2 volt (it is DC coupled). If the audio equipment requires AC coupled audio, use a 100uF capacitor between the output pin and the input of your device.

If you're connecting to an audio amplifier that has differential inputs or includes decoupling capacitors, the 100uF cap is not required.

If connecting to a microcontroller pin, you don't need an amplifier or decoupling capacitor - connect the OUT pin directly to the microcontroller ADC pin. For audio-reactive projects, use an FFT driver library that can take the audio input and translate it into frequencies.