MAX9814 Mic Amp Module with AGC for Arduino Projects
MAX9814 Electret Microphone Amplifier Module with AGC
The MAX9814 is a low-noise microphone amplifier with automatic gain control (AGC), tailored for electret microphones. It amplifies weak audio signals and adjusts gain dynamically to prevent clipping, making it ideal for audio capture in Arduino, ESP32, and Raspberry Pi projects. Use it to add voice input, sound detection, or audio recording to your electronics builds.
Key Specifications
| Specification | Value |
|---|---|
| Operating Voltage | 2.7V to 5.5V DC |
| Gain Options | 40dB, 50dB, 60dB (pin-selectable) |
| AGC Attack Time | 0.4 ms |
| AGC Release Time | 500 ms |
| Bandwidth | 20 Hz – 20 kHz |
| Output Swing | Rail-to-Rail |
What You Can Build With This
- Voice-activated LED strip that responds to claps or spoken commands
- Sound-reactive music visualizer with WS2812 LEDs
- Clap switch using an Arduino to toggle appliances
- Animal sound recorder with timestamp logging on an SD card
Compatibility
This module works seamlessly with any microcontroller having an analog input, such as Arduino Uno, ESP32, Raspberry Pi Pico, and STM32. It accepts standard electret microphone capsules with built-in bias circuitry, so no external components are needed. Operates on both 3.3V and 5V logic systems.
Wiring Notes
Connect VCC to 3.3V or 5V, GND to ground, and OUT to an analog pin. The GAIN pin can be left floating (60dB), tied to GND (50dB), or tied to VCC (40dB). Keep connections short to minimize noise; avoid running signal wires near high-current traces.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino?
Yes, connect the OUT pin to any analog input (e.g., A0 on Arduino Uno) and read with analogRead(). Use the onboard GAIN pin to set sensitivity.
How do I adjust the gain?
The module has three fixed gain settings selected by the GAIN pin: leave it unconnected for 60dB, connect to GND for 50dB, or connect to VCC for 40dB.
Does it work with a standard 3.5mm electret mic?
Yes, it is designed for common electret condenser microphone capsules, including those in 3.5mm form factors. It provides the required bias voltage internally.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
What you can build with this
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items