Microphone Amplifier Module GY-MAX4466

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The MAX4466 Operational Amplifier is coupled with an electret capsule microphone to create the Microphone Amplifier, which is intended for use in pre-amplifier applications for microphones. This module can be used in a wide range of audio applications thanks to its adjustable gain and flexible supply voltage.

Package Includes:

  • 1x Microphone Amplifier Module GY-MAX4466
  • 3x M/M Pin Headers


  • +3.3vto +5.5V Supply Voltage Operation.
  • Electret Microphone Amplifier
  • An Adjustable Gain Module.
  • Excellent Power-Supply Rejection Ratio: 112dB.
  • Excellent Common-Mode Rejection Ratio: 126dB.
  • High AVOL: 125dB (RL = 100kΩ).
  • Rail-to-Rail Outputs.
  • Low 24µA Quiescent Supply Current.
  • Great sound
  • Gain Bandwidth: 600kHz AV ≥ 5 (MAX4466/MAX4468)


A 20-20KHz electret microphone has been soldered onto the completely manufactured and tested MAX4466 Electret Microphone Amplifier with an Adjustable Gain Module. The Maxim MAX4466 ic, an op-amp specifically created for this delicate task, was used for the amplification. The amplifier has outstanding power supply noise rejection, so it sounds great and isn't nearly as noisy or scratchy as other mic amp breakouts that have been tested! The projects that benefit most from the use of this MAX4466 Electret Microphone Amplifier with Adjustable Gain Module include voice changes, audio recording/sampling, and audio-reactive projects that employ FFT. We have a little trimmer pot to change the gain on the rear. The gain ranges from 25x to 125x. That drops to around 200mVpp (for standard speaking volume about 6′′ away), which is excellent for connecting to equipment that accepts "line level" input without clipping, or up to about 1Vpp, which is ideal for reading from a microcontroller ADC. Because the output is rail-to-rail, it can reach 5Vpp if the sounds become loud.

Principle of Work:

Connect VCC to 2.4-5VDC and GND to the ground. The OUT pin will output the audio waveform. When everything is completely silent, the output will have a DC bias of VCC/2, resulting in a constant VCC/2 volt voltage (DC couple). Place a 100uF capacitor between the output pin and the input of your device if the audio equipment you're using requires AC-coupled audio. The 100uF cap is not necessary if you are connected to an audio amplifier with differential inputs or decoupling capacitors. You'll need an audio amplifier because the output pin is not intended to drive anything other than the tiniest in-ear headphones or speakers (such as a 3.7W stereo amp), If you wish to directly connect speakers to the amplifier. You don't need an amplifier or decoupling capacitor when connecting to a microcontroller pin; simply connect the OUT pin to the ADC pin.
We advise using an FFT driver library for audio-responsive projects since it can 'translate' audio input into frequencies.

Pinout of the Module:


 The sound sensor has 3 pins that link to a microcontroller:

  • VCC: Module power supply – 3-5.5 V
  • GND: Ground
  • OUT: Analog output data to the microcontroller


  • Measuring the intensity or frequency of sound.
  • Vary the lighting of an LED strip depending on the sound,
  • Display an equalizer on a TFT screen.


The electrical schematic is simple. We power the module by connecting GND and 5V to the corresponding pins of the Arduino. On the other hand, we connect the analog output of the sensor to an Arduino analog input.

MAX4466  Arduino

VCC              5V

GND             GND

OUT             A0

Adjust the Gain: Although the amplifier is capable of a rail-to-rail signal, you can adjust the gain trimmer-pot of the amplifier with a small straight-bladed screwdriver. The amplifier gain is adjustable from 25x to 125x.



This Module doesn't need a library to work.


When we handle sounds, the first thing we must understand is that the signal we obtain varies quickly and also has a lot of noise.

To do this, we define a time window of 50 ms, equivalent to a frequency of 20 Hz, and we calculate the maximum and minimum recorded within the window. Next, we show the value registered by serial port.

const int sensorPIN = A0;
const int sampleWindow = 50; // Ancho ventana en mS (50 mS = 20Hz)
void setup()
void loop()
 unsigned long startMillis= millis();
 unsigned int signalMax = 0;
 unsigned int signalMin = 1024;
 // Recopilar durante la ventana
 unsigned int sample;
 while (millis() - startMillis < sampleWindow)
 sample = analogRead(sensorPIN);
 if (sample < 1024)
 if (sample > signalMax)
 signalMax = sample; //
 else if (sample < signalMin)
 signalMin = sample; //
 unsigned int peakToPeak = signalMax - signalMin; // Amplitud del sonido
 double volts = (peakToPeak * 5.0) / 1024; // Convertir a tensión

Technical Details:

  • Supply Voltage Operation: +2.4V to +5.5V.
  • Excellent Power-Supply Rejection Ratio: 112dB.
  • Excellent Common-Mode Rejection Ratio: 126dB.
  • High AVOL: 125dB (RL = 100kΩ).
  •  Board size: 15*9mm


IC Amplifier Max9812 Datasheet Click


How to calculate decibels 


While the MAX9814 has an automatic gain control, the MAX4466 is rather traditional and has an integrated op-AMP and gain that can alter from 25x to 125x. However, it is evident that "max gain" can be altered. The SPW2430 is the smallest and most likely the best for audio detection, although the two previous ones can be used for recording or sampling. However, because of the output peak-to-peak voltage's 0.67V DC bias and around 100mVpp, it is more likely to clip or seize on loud sounds..