MAX9814 Microphone AGC Amplifier Module

The MAX9814 Microphone AGC Amplifier Module is a compact, high-quality audio front-end built around the MAX9814 IC, designed to capture clear sound while automatically adjusting gain to prevent clipping on loud noises and boosting faint, distant sounds. Unlike basic microphone amplifiers, this module includes onboard Automatic Gain Control (AGC), a low-noise microphone bias generator, and an adjustable attack-to-release ratio, giving hobbyists precise control over how the amplifier responds to changing sound levels. It is well suited for voice recognition systems, sound-level detection, audio recording projects, smart home voice interfaces, and general environmental sound sensing. The board outputs a clean analog audio signal that can be fed directly into the ADC pin of a microcontroller such as Arduino, ESP32, or Raspberry Pi Pico, making it an easy addition to any voice or sound-based project. Selectable gain settings of 40dB, 50dB, or 60dB allow fine-tuning for different microphone sensitivities and use cases, while the built-in electret microphone eliminates the need for external components. Compact, breadboard-friendly, and simple to wire with just power, ground, and an analog output connection, this module is a reliable choice for makers and students exploring audio electronics, voice control, or acoustic sensing applications.

Specification:

• IC Used : MAX9814
• Supply Voltage : 2.7V – 5.5V
• Gain Options : 40dB, 50dB, 60dB
• Output Type : Analog Audio Signal
• Output DC Bias : 1.23V
• AGC Hold Time : 30ms
• Preamplifier Gain : 12dB (fixed)
• Package : Breakout Module with Onboard Microphone