MAX9814 Microphone Preamplifier Module – Adjustable Gain 40dB / 50dB / 60dB

Take your audio projects to the next level with the MAX9814 Microphone Preamp Module. Built around the MAX9814 IC, this compact amplifier board delivers clean, low-noise audio capture with selectable gain settings of 40dB, 50dB, and 60dB — perfect for makers, hobbyists, and engineers integrating microphone input into development board projects.

Key Features

Automatic Gain Control (AGC): Built-in AGC provides three selectable gain settings (40dB, 50dB, 60dB), ensuring clear and consistent audio input across a wide range of environments.
Broad Compatibility: Designed to work seamlessly with popular development boards including ESP8266 and similar platforms — no additional adapters required.
Ultra-Low Noise Performance: Input-referred noise density of just 30nV/√Hz delivers exceptionally clean audio with minimal background interference.
Wide Supply Voltage Range: Operates from 2.7V to 5.5V, making it flexible and compatible with a wide variety of power supplies and microcontroller setups.
Fast Response: Programmable attack and release time ratios ensure rapid, smooth response to audio level changes for natural-sounding output.
Low Total Harmonic Distortion: Typical THD of just 0.04% for high-fidelity audio capture.

Technical Specifications

Gain Settings: 40dB, 50dB, 60dB (selectable)
Supply Voltage: 2.7V – 5.5V @ 3mA
Input Noise Density: 30nV/√Hz
THD: 0.04% (typical)
Microphone Bias: 2V low-noise
Output: 2Vpp at 1.25V bias
Frequency Response: 20Hz – 20kHz
IC Package: 14-pin TDFN (3mm × 3mm)
Module Dimensions: approx. 25.4 × 14mm (1 × 0.55 in)

Package Includes

1 × MAX9814 Microphone Amplifier Board

Ships from: CN (China)

Looking for complementary components for your DIY builds? Check out our DIY Making Supplies or explore our Round Aluminum Wire for DIY Projects to round out your maker toolkit.

Please allow 1–2cm tolerance due to manual measurement. Slight color variation may occur due to different display settings.

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Frequently Asked Questions

Q: What is the MAX9814 Microphone Preamp Module and what does it do?

A: The MAX9814 Microphone Preamp Module is a compact audio amplifier board based on the Maxim MAX9814 IC. It amplifies microphone-level signals with selectable gain settings of 40dB, 50dB, or 60dB and features built-in Automatic Gain Control (AGC) for consistent audio capture. It is ideal for use with microcontrollers and development boards such as the ESP8266 in DIY electronics, voice recognition, and audio recording projects.

Q: Which development boards is the MAX9814 module compatible with?

A: The MAX9814 Microphone Preamp Module is designed for broad compatibility with popular development platforms including ESP8266, Arduino, Raspberry Pi, and similar boards. Its wide supply voltage range of 2.7V to 5.5V means it integrates easily into most common microcontroller ecosystems without additional circuitry.

Q: How do I select between the 40dB, 50dB, and 60dB gain settings?

A: The gain setting is selected via the GAIN pin on the module. By connecting the GAIN pin to VDD, GND, or leaving it floating (open), you can set the amplifier to 40dB, 50dB, or 60dB respectively. Refer to the MAX9814 datasheet for exact pin configuration details to match your project's audio input requirements.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.