GY-MAX4466 Electret Microphone Amplifier Module — Adjustable Gain, 2.4–5.5V, Arduino

GY-MAX4466 Electret Microphone Amplifier Module — Adjustable Gain, 2.4–5.5V

The GY-MAX4466 module uses the Maxim MAX4466 microphone amplifier IC with a built-in electret microphone capsule — providing a ready-to-use analog audio output that connects directly to an Arduino ADC pin. An on-board trimmer potentiometer adjusts the gain from 25× to 125× (28–42dB), allowing sensitivity tuning for different acoustic environments. The MAX4466 operates from 2.4V to 5.5V, making it compatible with both 3.3V and 5V microcontrollers.

Module Specifications

• Amplifier IC: MAX4466
• Microphone: Built-in electret capsule
• Gain Range: 25× to 125× (adjustable via trimmer)
• Output: Analog audio (AC-coupled, centered at VCC/2)
• Supply Voltage: 2.4V – 5.5V
• Supply Current: ~100μA (ultra-low power)
• Frequency Response: 20Hz – 20kHz
• Output Pins: VCC, GND, OUT (analog)

Arduino Sound Level Reading

• VCC → 3.3V/5V | GND → GND | OUT → A0
• Output is centered at VCC/2 — read multiple samples and find peak-to-peak amplitude
• Adjust trimmer for desired sensitivity before use
• Use with FFT library for frequency analysis

MAX4466 vs MAX9814 vs INMP441

• MAX4466 (this module): Analog output, adjustable gain, simple — for basic sound level and clap detection
• MAX9814: Auto gain control (AGC), analog output — for voice recording with varying volumes
• INMP441: I²S digital output, high quality — for ESP32 audio processing and speech recognition

Typical Applications

• Arduino sound level meter
• Clap switch and sound-activated trigger
• Voice activity detection
• Audio spectrum analyzer (with FFT)
• Noise level monitoring

GY-MAX4466 microphone amplifier module — adjustable gain 25–125×, 2.4–5.5V, analog output for Arduino sound detection, audio level, and clap switch projects.

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