MAX9814 Microphone Amplifier Module AGC Auto Gain Control 2.7-5.5V Arduino

Description �� MAX9814 Microphone Amplifier Module | AuscomTech The MAX9814 Microphone Amplifier Module is a compact low-noise audio front-end board designed for capturing microphone signals for microcontroller and embedded audio projects. It combines a low-noise preamplifier, variable gain stage, output amplifier, microphone bias generator, and automatic gain control (AGC) in one module to deliver a stable analog audio output. This module is commonly used for voice detection, sound-reactive projects, audio sampling, and microphone input applications with Arduino, ESP32, and similar development platforms. ⭐ Key Features Automatic Gain Control – Built-in AGC helps maintain a more consistent output level across changing sound volumes. Low Noise Audio Front End – Designed for clear microphone signal amplification with low input-referred noise. Programmable Gain Options – Supports selectable total gain settings of 40dB, 50dB, or 60dB. Programmable Attack and Release Behaviour – Suitable for applications needing controlled AGC response timing. Wide Supply Range – Operates from 2.7V to 5.5V for easy integration with common logic supplies. Low THD Performance – Typical low distortion makes it suitable for audio sensing and voice input projects. Microcontroller Friendly – Analog output can be interfaced with ADC-capable boards for audio level monitoring and sampling. �� Technical Specifications Main IC: MAX9814 Function: Microphone amplifier module with AGC Supply Voltage: 2.7V to 5.5V DC Gain Settings: 40dB, 50dB, 60dB Fixed Preamplifier Gain: 12dB AGC VGA Range: 20dB to 0dB Typical THD: 0.04% Input Noise Density: Up to 30nV/√Hz Microphone Bias: Internal low-noise bias, 2V Operating Temperature: -40°C to 85°C Output Type: Analog audio signal �� Typical Applications Arduino and ESP32 audio input projects Voice and sound level detection Portable audio recorders Digital camera and headset audio circuits Intercom and teleconference devices Sound-reactive lighting and automation Embedded microphone front-end designs ⚠️ Important Notes This is an analog microphone amplifier module, not a digital microphone. Output should be connected to a suitable analog input or audio processing circuit. Not designed to drive speakers directly. Check board pin labels and supply voltage before wiring. Module layout or component placement may vary slightly between production batches. �� Package Includes 1 × MAX9814 Microphone Amplifier Module �� Recommended Accessories (Not Included) Arduino or ESP32 board – for analog signal reading and processing Dupont jumper wires – for quick prototyping connections Breadboard – for testing and development 5V or 3.3V regulated power supply – for stable module operation