MAX9814 Microphone Amplifier Module with Automatic Gain Control AGC

The MAX9814 Microphone Amplifier Module is a high-quality electret microphone amplifier board featuring built-in Automatic Gain Control (AGC). It is designed to amplify microphone audio signals while automatically adjusting the gain according to changes in sound level. This makes it suitable for electronics projects where audio levels can vary significantly.

The module is based on the MAX9814 microphone amplifier IC, which integrates a low-noise preamplifier, variable gain amplifier, output amplifier, microphone bias circuit, and AGC circuitry. The amplifier provides selectable maximum gains of 40dB, 50dB, or 60dB and operates from a 2.7V to 5.5V single supply. The built-in microphone bias circuit is designed to support most electret microphones.

This module can be used with Arduino, ESP32, ESP8266, Raspberry Pi, and other microcontroller or development boards with analog audio input capability. It is suitable for voice detection, sound-reactive LED projects, audio monitoring, voice recording, sound measurement, robotics, IoT projects, and other DIY electronics applications.

Specifications:

• Module Name: MAX9814 Microphone Amplifier Module
• IC: MAX9814
• Module Type: Electret Microphone Amplifier with AGC
• Audio Input: Electret Microphone
• Automatic Gain Control: Yes
• Selectable Maximum Gain: 40dB / 50dB / 60dB
• Supply Voltage: 2.7V to 5.5V DC
• Microphone Bias: Internal low-noise 2V bias
• Preamplifier Gain: 12dB
• Variable Gain Amplifier: 0dB to 20dB automatic adjustment
• Output Amplifier Gain: 8dB / 18dB / 28dB selectable
• Low Input-Referred Noise Density: 30nV/√Hz
• Typical Total Harmonic Distortion: 0.04%
• Output: Analog audio signal
• Shutdown Function: Supported by MAX9814 IC
• Application: Voice Detection, Sound Detection, Audio Recording, Sound Reactive Projects
• Compatible Platforms: Arduino, ESP32, ESP8266, Raspberry Pi and other compatible controllers
• Suitable For: DIY Electronics, Robotics, IoT, Audio Projects and Educational Projects