MAX9814 Electret Microphone Amplifier with Auto Gain Control (AGC) for Arduino

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 Automatic Gain Control (AGC) – Adjustable gain levels at 40dB, 50dB, or 60dB Low Noise Performance – Input-referred noise density as low as 30nV/√Hz Frequency Response – Full audio spectrum: 20Hz to 20kHz Low THD (Total Harmonic Distortion) – 0.04% (typical) for clean sound capture Flexible Power Supply – Operates from 2.7V to 5.5V at ~3mA current Output – 2Vpp on 1.25V bias, rail-to-rail capability up to 5Vpp Compact Size – Space-saving 14-pin TDFN package on a breakout board Wide Temperature Range – Operates from -40°C to 85°C Low-Power Shutdown Mode Technical Specifications Supply Voltage: 2.7V – 5.5V Current Consumption: ~3mA Output: 2Vpp on 1.25V bias, rail-to-rail up to 5Vpp Gain Settings: 40dB / 50dB / 60dB (selectable) Frequency Response: 20Hz – 20kHz Input Noise Density: 30nV/√Hz THD: 0.04% typical Operating Temp Range: -40°C to 85°C How to Use Wiring: Connect VCC to 2.4–5VDC (use the quietest supply possible, e.g., 3.3V on Arduino). Connect GND to ground. Connect OUT to your microcontroller ADC pin or audio input device. Output Signal: The output signal is DC-biased at VCC/2. For AC-coupled equipment, use a 100µF capacitor between OUT and your device. Applications: Voice changers Sound recording & sampling Audio-reactive LED/music projects FFT-based frequency analysis Microphone input for Arduino/MCU projects ⚠️ Note: This module cannot directly drive speakers. For audio output, pair with a power amplifier. Package Includes 1 × MAX9814 Electret Microphone Amplifier Module