Electret Mic Amplifier – Adjustable Gain

The Electret Microphone Amplifier Module is a compact audio sensing module designed to capture and amplify sound signals for embedded systems and microcontroller applications. It features an onboard electret microphone and adjustable gain amplifier that allows gain control from 25x to 125x using a trimmer potentiometer. The module provides a rail-to-rail analog output suitable for direct connection to ADC inputs on microcontrollers. Operating from a wide 2.4–5 V supply range, it ensures stable performance for audio detection, sound analysis, and audio-reactive projects. Ideal for Arduino, ESP, and other embedded audio sensing applications.

Features

- Electret microphone with integrated audio amplifier

- Adjustable gain from 25x to 125x via onboard trimmer

- Rail-to-rail analog output signal

- Output amplitude up to 5 Vpp for loud sounds

- DC biased output at VCC/2 for stable ADC sampling

- Wide operating voltage range 2.4–5 V DC

- Compatible with Arduino and other microcontrollers

Suitable for audio detection and sound analysis

- Direct connection to microcontroller ADC input

- Compact PCB design for embedded applications

- Supports AC coupling using external capacitor if required

Ideal for audio-reactive and FFT based projects

Specifications

- Operating Voltage: 2.4–5V DC

- Microphone Type: Electret Condenser Microphone

- Gain Adjustment Range: 25x – 125x

- Output Type: Analog Rail-to-Rail

- Maximum Output Signal: Up to 5Vpp

- Output Bias Voltage: VCC / 2

- Output Interface: Analog OUT Pin

- Recommended Decoupling Capacitor: 100µF (for AC coupling if required)

- Compatible Logic Systems: 3.3V and 5V Microcontrollers

- Operating Temperature: ?20°C to 70°C

- PCB Type: Compact Microphone Amplifier Module

- Applications: Audio detection, sound monitoring, FFT analysis

Links

- Electret Microphone Amplifier Module Datasheet

- Electret Microphone Amplifier Module 3D Model

- Electret Microphone Amplifier Module 3D Case

Tutorials

- MAX4466 Electret Microphone Preamp Module Evaluation