MAX9814 Electret Microphone Amplifier Module | AGC Auto Gain Control

Stop Audio Clipping with Automatic Gain Control (AGC) Standard microphone modules often struggle with dynamic audio environments—whispers are too quiet to detect, while loud claps cause severe distortion and clipping. The MAX9814 Microphone Amplifier eliminates this problem using advanced Automatic Gain Control (AGC). This built-in hardware feature dynamically adjusts the amplifier's gain in real-time. It automatically turns down the volume when sounds get too loud and boosts the sensitivity when sounds are quiet, ensuring your microcontroller receives a smooth, consistent analog waveform. Selectable Gain for Any Environment Not every project requires the same level of sensitivity. The MAX9814 module features a dedicated "Gain" pin that allows you to easily configure the maximum amplification level. You can set it to 40dB, 50dB, or 60dB depending on your application. Whether you are building a sensitive sleep-talking recorder or a loud karaoke entertainment system, this module adapts perfectly to your acoustic environment. Ultra-Low Noise & High-Fidelity Output Designed for high-quality audio applications, this module boasts an incredibly low Total Harmonic Distortion (THD) of just 0.04%. It includes an internal low-noise 2V microphone bias, ensuring that the analog signal sent to your Arduino's ADC (Analog-to-Digital Converter) is clean and free from static interference. The output is a 2Vpp max signal with a 1.25V DC offset, making it incredibly easy to read with standard 3.3V or 5V microcontrollers. 💡 Pro Tip from Our Technicians "Wiring the Gain pin on the MAX9814 is incredibly simple but often overlooked by beginners! As printed on the back of the PCB: if you leave the Gain pin floating (unconnected), the module defaults to a highly sensitive 60dB. If you connect the Gain pin to GND, it drops to 50dB. Connecting it to VDD sets it to 40dB."