Description
MAX9814 Electret Microphone Amplifier Module with Auto Gain Control (AGC) – For Arduino & Audio Projects
Product Description
Add high-quality sound detection to your electronics project with the MAX9814 Electret Microphone Amplifier Module with Automatic Gain Control (AGC). This compact, reliable board is designed for Arduino, microcontrollers, and audio-reactive projects.
Featuring a built-in low-noise electret microphone, a powerful MAX9814 amplifier IC, and automatic gain adjustment, this module ensures crystal-clear audio capture across a wide frequency range of 20Hz–20kHz. The AGC automatically adjusts sensitivity, making it ideal for voice recognition, sound sampling, recording, and reactive applications such as LED sound visualizers or FFT-based projects.
Unlike many other microphone boards, the MAX9814 delivers low noise, low distortion (THD: 0.04% typ), and excellent power supply rejection, making it stable even in noisy environments.
Key Features
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Automatic Gain Control (AGC) – Adjustable gain levels at 40dB, 50dB, or 60dB 
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Low Noise Performance – Input-referred noise density as low as 30nV/√Hz 
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Frequency Response – Full audio spectrum: 20Hz to 20kHz 
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Low THD (Total Harmonic Distortion) – 0.04% (typical) for clean sound capture 
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Flexible Power Supply – Operates from 2.7V to 5.5V at ~3mA current 
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Output – 2Vpp on 1.25V bias, rail-to-rail capability up to 5Vpp 
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Compact Size – Space-saving 14-pin TDFN package on a breakout board 
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Wide Temperature Range – Operates from -40°C to +85°C 
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Low-Power Shutdown Mode 
Technical Specifications
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Supply Voltage: 2.7V – 5.5V 
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Current Consumption: ~3mA 
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Output: 2Vpp on 1.25V bias, rail-to-rail up to 5Vpp 
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Gain Settings: 40dB / 50dB / 60dB (selectable) 
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Frequency Response: 20Hz – 20kHz 
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Input Noise Density: 30nV/√Hz 
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THD: 0.04% typical 
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Operating Temp Range: -40°C to +85°C 
How to Use
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Wiring: - 
Connect VCC to 2.4–5VDC (use the quietest supply possible, e.g., 3.3V on Arduino). 
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Connect GND to ground. 
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Connect OUT to your microcontroller ADC pin or audio input device. 
 
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Output Signal: - 
The output signal is DC-biased at VCC/2. For AC-coupled equipment, use a 100µF capacitor between OUT and your device. 
 
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Applications: - 
Voice changers 
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Sound recording & sampling 
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Audio-reactive LED/music projects 
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FFT-based frequency analysis 
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Microphone input for Arduino/MCU projects 
 
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⚠️ Note: This module cannot directly drive speakers. For audio output, pair with a power amplifier.
Package Includes
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1 × MAX9814 Electret Microphone Amplifier Module 










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