Description
Electret Condenser Microphone Amplifier Module with Adjustable Gain & AGC Options
The Electret Condenser Microphone Amplifier Module is a high-performance audio input solution designed for voice detection, sound analysis, and audio processing projects. Available in two popular variants—MAX4466 (manual adjustable gain) and MAX9814 (automatic gain control - AGC)—this module offers flexibility for different audio applications.
The MAX4466 variant features a low-noise op-amp with adjustable gain from 25x to 125x, delivering clean and stable audio signals. The MAX9814 variant includes automatic gain control (AGC), dynamically adjusting amplification for consistent audio output, making it ideal for speech recognition and recording.
With a 20Hz–20kHz frequency response, low noise, and rail-to-rail output, this module is perfect for microcontroller-based audio projects, IoT systems, and sound-reactive applications.
Key Features
- Two Variants Available – MAX4466 (manual gain) & MAX9814 (AGC).
- Wide Frequency Response – 20Hz to 20kHz for full audio range.
- Low Noise Performance – Clear and stable audio output.
- Adjustable Gain (MAX4466) – 25x to 125x via onboard trimmer.
- Automatic Gain Control (MAX9814) – Maintains consistent audio levels.
- Rail-to-Rail Output – Suitable for ADC and signal processing.
- Microcontroller Compatible – Works with Arduino, ESP, Raspberry Pi.
- Compact & Ready-to-Use Module – Fully assembled with microphone.
- Low Power Consumption – Ideal for portable applications.
Technical Specifications
🔹 MAX4466 Variant
| Parameter | Specification |
|---|---|
| Supply Voltage | 2.4V – 5.5V |
| Gain Range | 25x – 125x |
| Frequency Response | 20Hz – 20kHz |
| Output | Up to ~5Vpp (rail-to-rail) |
| Current Consumption | ~24µA |
| IC Used | MAX4466 |
| Output Bias | VCC/2 |
🔹 MAX9814 Variant
| Parameter | Specification |
|---|---|
| Supply Voltage | 2.7V – 5.5V |
| Gain Settings | 40dB / 50dB / 60dB |
| Output | ~2Vpp on 1.25V bias |
| Frequency Response | 20Hz – 20kHz |
| THD | 0.04% (typical) |
| Noise Density | 30nV |
| Features | AGC, programmable attack/release |
Applications
- Voice Recognition Systems
- Audio Recording & Sampling
- Sound Detection Projects
- Audio Reactive LED Projects (FFT)
- IoT Audio Monitoring Devices
- Bluetooth & Communication Devices
- DIY Electronics & Robotics
Precautions
- Do not connect directly to speakers without an amplifier.
- Ensure correct power supply (2.4V–5.5V).
- Use capacitor for AC coupling if required.
- Avoid exposure to excessive noise or voltage spikes.
- Handle carefully to avoid damaging the microphone.