MAX9814 Microphone Amplifier Module

Professional Audio Capture with MAX9814 AGC Technology

The MAX9814 Microphone Amplifier Module is a high-quality solution for audio projects where sound levels vary unpredictably. Unlike standard microphone modules, the MAX9814 features integrated Automatic Gain Control (AGC), which intelligently levels audio output—making quiet sounds audible while preventing loud noises from clipping or distorting.

Why the MAX9814 Stands Out

The heart of this module is the Maxim Integrated MAX9814 chip, which includes a low-noise front-end amplifier, a variable gain amplifier (VGA), and an output amplifier. This makes it significantly more sophisticated than the basic KY-038 or MAX4466 modules.

Core Features:

• Automatic Gain Control (AGC): Stabilizes audio signals in noisy or quiet environments.

• Three Gain Settings: Easily adjust the maximum gain to 40dB, 50dB, or 60dB by jumpering the Gain pin to VCC or Ground.

• Integrated Noise Reduction: Built-in 2V low-noise microphone bias.

• Wide Voltage Compatibility: Works seamlessly with 3.3V and 5V logic (2.7V - 5.5V supply).

• Programmable Ratio: Adjustable Attack and Release ratio for fine-tuning audio response.

Technical Specifications:

Best Use Cases:

1. Voice Recognition: Ideal for smart home assistants (Alexa/Google Home DIY).

2. Sound Level Monitoring: Consistent data for decibel meters and environmental sensors.

3. Video Recorders: Clearer audio for DIY camera kits.

4. Wireless Audio: Clean input for Bluetooth or Wi-Fi audio transmission.

Pinout Guide:

• VCC: 2.7V - 5.5V Power

• GND: Ground

• Out: Audio Output Signal

• Gain: Gain Select (Unconnected = 60dB, GND = 50dB, VCC = 40dB)

• AR: Attack/Release ratio adjustment