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MAX4466 Audio Amplifier Module – Compact Microphone Preamp for Arduino/Raspberry Pi

SKU: FA3020-2
Module Type

Audio amplifier / microphone preamp
Amplifier IC

MAX4466
Sensor Type

Electret condenser microphone
Operating Voltage

2.4V – 5.5V DC
Gain Range

Approximately 25x – 125x (adjustable)
Output Type

Analog (audio waveform)
Bandwidth

20Hz – 20kHz (typical)
Pin Count

3 pins (VCC, GND, OUT)

The MAX4466 Audio Amplifier Module is a compact, high-performance microphone preamplifier board designed for Arduino, Raspberry Pi, ESP32, and other microcontroller projects. Built around the MAX4466 operational amplifier from Maxim Integrated (now Analog Devices), this module provides clean, adjustable audio amplification for capturing sound, measuring ambient noise, and building audio-reactive projects. It is an ideal solution for sound level meters, voice recording, clap detection, and audio spectrum analyzers.

At the heart of the module is the MAX4466, a low-cost, low-power operational amplifier optimized for microphone preamplification. It features rail-to-rail outputs, low noise, and high gain bandwidth, making it well-suited for amplifying the weak signal from the onboard electret condenser microphone. The amplified output is available on the OUT pin as an analog voltage that varies with the sound waveform.

The module includes an onboard potentiometer for adjusting the gain from approximately 25x to 125x. This allows you to optimize the output signal level for your specific application — higher gain for quiet environments and lower gain for loud environments. The adjustable gain makes the module versatile for both close-range and distant sound capture.

The analog output connects directly to your microcontroller’s ADC pin, allowing you to sample the audio waveform in real time. This enables a wide range of applications including:

  • Sound level measurement — Calculate RMS or peak-to-peak amplitude

  • Clap and sound detection — Trigger events based on sound thresholds

  • Audio visualization — Drive LED strips or displays with sound-reactive effects

  • Voice recording — Capture audio for storage or transmission

  • Frequency analysis — Perform FFT to identify dominant frequencies

The module operates from a 2.4V to 5.5V DC supply, making it compatible with both 3.3V and 5V microcontrollers. The compact form factor with mounting holes allows easy integration into custom enclosures, portable devices, and sound-reactive projects. The 3-pin interface (VCC, GND, OUT) provides simple, straightforward wiring.

The MAX4466 Audio Amplifier Module is widely used in sound level meters, clap detectors, voice-activated projects, audio spectrum analyzers, noise monitoring systems, interactive art installations, and educational STEM projects. It is also popular in DIY electronics and maker projects where clean audio amplification is required.

Important Note: The MAX4466 amplifies the audio waveform, not just the sound level. The output is an analog signal that follows the audio waveform, so your microcontroller must sample it fast enough (typically 1kHz–10kHz) to capture the signal accurately. For simple sound level measurement, you can calculate the peak-to-peak amplitude or RMS value in software. The module is not waterproof and should be kept dry.

Whether you are building a sound level meter, a voice recorder, or an audio-reactive LED display, the MAX4466 Audio Amplifier Module provides a reliable, affordable solution with clean, adjustable audio amplification. It is suitable for individual makers, students, and businesses purchasing in bulk for product development or educational programs.

Features

  • MAX4466 operational amplifier — Low-noise, rail-to-rail audio preamplification

  • Adjustable gain — Onboard potentiometer for 25x to 125x amplification

  • High-sensitivity electret microphone — Captures ambient sound accurately

  • Analog output — Direct connection to microcontroller ADC pins

  • Wide voltage range — 2.4V to 5.5V DC, compatible with 3.3V and 5V systems

  • Low power consumption — Suitable for battery-powered applications

  • Compact form factor — With mounting holes for easy integration

  • 3-pin interface — VCC, GND, OUT for simple connection

  • Wide application range — Sound level meters, clap detectors, voice recording, audio visualization

  • Cost-effective — Affordable solution for audio amplification in volume production

Technical Specifications 

# Parameter Specification
1 Module Type Audio amplifier / microphone preamp
2 Amplifier IC MAX4466
3 Sensor Type Electret condenser microphone
4 Operating Voltage 2.4V – 5.5V DC
5 Gain Range Approximately 25x – 125x (adjustable)
6 Output Type Analog (audio waveform)
7 Bandwidth 20Hz – 20kHz (typical)
8 Pin Count 3 pins (VCC, GND, OUT)

Usage

Getting Started

  1. Connect power — Supply 2.4V to 5.5V DC to the VCC pin and GND to ground.

  2. Connect the output — Connect the OUT pin to an analog input pin on your microcontroller (e.g., A0 on Arduino).

  3. Adjust gain — Use the onboard potentiometer to set the amplification level. Turn clockwise to increase gain, counter-clockwise to decrease.

  4. Upload a test sketch — Sample the analog output at a high rate (e.g., 1kHz–10kHz) and observe the values change with sound.

  5. Implement processing — Calculate peak-to-peak amplitude, RMS, or perform FFT analysis to extract useful information from the audio signal.

Pin Connections

Module Pin Function
VCC Power (2.4V–5.5V)
GND Ground
OUT Analog audio output

Example Arduino Code (Sound Level Measurement)

cpp
#define MIC_PIN A0

void setup() {
  Serial.begin(9600);
}

void loop() {
  int signalMax = 0;
  int signalMin = 1023;

  // Sample for 50ms
  unsigned long start = millis();
  while (millis() - start < 50) {
    int sample = analogRead(MIC_PIN);
    if (sample > signalMax) signalMax = sample;
    if (sample < signalMin) signalMin = sample;
  }

  int peakToPeak = signalMax - signalMin;
  Serial.print("Peak-to-Peak: ");
  Serial.println(peakToPeak);

  delay(200);
}

Typical Applications

  • Sound level meters — Measure ambient noise in decibels

  • Clap detectors — Trigger actions with hand claps

  • Voice-activated projects — Start recording or activate devices with sound

  • Audio visualization — Drive LED strips or displays with sound-reactive effects

  • Noise monitoring — Track sound levels over time

  • Voice recording — Capture audio for storage or transmission

  • Frequency analysis — Perform FFT to identify dominant frequencies

  • Educational STEM projects — Teaching audio amplification and signal processing

Notes for Business Buyers

  • Clean audio amplification — MAX4466 provides low-noise, rail-to-rail output.

  • Adjustable gain — One module adapts to different sound environments.

  • Simple interface — Single analog output connects directly to any microcontroller ADC.

  • Suitable for bulk purchasing — Ideal for sound level meter manufacturers, audio product developers, and educational institutions.

Q: What is the MAX4466 Audio Amplifier Module used for?

It is a microphone preamplifier for sound level meters, clap detectors, voice recording, audio visualization, and audio spectrum analyzers.

Q: What is the difference between MAX4466 and MAX9814?

The MAX4466 is a simple operational amplifier with adjustable gain (25x–125x). The MAX9814 includes an automatic gain control (AGC) and a fixed 60dB gain option, making it better for automatic recording applications. The MAX4466 is preferred for manual control and measurement.

Q: What voltage does the module require?

It operates from 2.4V to 5.5V DC, making it compatible with 3.3V and 5V microcontrollers.

Q: How do I adjust the gain?

Use the onboard potentiometer. Turn clockwise to increase gain (up to 125x) or counter-clockwise to decrease (down to 25x).

Q: What is the output signal?

The module outputs an analog voltage that follows the audio waveform, centered at approximately VCC/2.

Q: How do I measure sound level?

Sample the analog output at high speed (1kHz–10kHz), then calculate the peak-to-peak amplitude or RMS value to determine sound intensity.

Q: Can I use this module with a Raspberry Pi?

Yes. The Raspberry Pi has no built-in ADC, so you will need an external ADC (such as the MCP3008) to read the analog output.

Q: What is the frequency response?

The module has a typical frequency response of 20Hz to 20kHz, suitable for audio and voice applications.

Q: Is the module waterproof?

No. The module is not waterproof and should be kept dry.

Q: Can I purchase in bulk for a product development project?

Yes. This module is suitable for both individual users and business purchasing, including sound level meter manufacturers, audio product developers, and educational institutions.

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