Overview: The MAX4466 Electret Microphone Preamplifier Module is a compact, high-performance audio preamp board designed to boost weak signals from electret microphones for clear audio input in recording, amplification, or signal processing applications. Featuring the Maxim Integrated MAX4466 IC, this module provides adjustable gain up to 60dB, making it ideal for DIY audio projects, voice-activated devices, noise-canceling setups, and interfacing with microcontrollers like Arduino. The black PCB includes solderable pins for easy integration, supporting low-power operation from 2.4V to 5V DC.
Key Specifications:
Parameter
Value/Detail
IC Chip
MAX4466 (Low-Noise Microphone Preamp)
Input Type
Electret Microphone (included or external)
Gain Range
25dB to 60dB (adjustable via onboard potentiometer)
Input Voltage Range
2.4V – 5V DC
Output Voltage Swing
Rail-to-rail (up to supply voltage)
Frequency Response
20Hz – 20kHz (±3dB)
Total Harmonic Distortion (THD)
<0.01% (at 1kHz, mid-gain)
Signal-to-Noise Ratio (SNR)
>90dB (A-weighted)
Quiescent Current
<1mA (ultra-low power)
Output Impedance
10kΩ (line-level compatible)
Dimensions
Approx. 25mm x 20mm x 3mm
Weight
~5g
Operating Temperature
-40°C to +85°C
Connections:
Power (VCC/GND): Pin headers for 2.4V-5V DC supply (positive to VCC, ground to GND; marked as + and – on board).
Audio Input: Solder point or pad for electret microphone (bias provided by module).
Audio Output (L/R or OUT/GND): Pin headers for left/right channel output (line-level signal to amp or ADC).
Gain Adjustment: Onboard trimmer potentiometer to set amplification level (turn clockwise to increase gain).
Bypass/AGC: Optional pins for automatic gain control or high-pass filter engagement.
Features and Benefits:
High Gain Flexibility: Adjustable from 25dB (mic to line) to 60dB for capturing faint sounds like whispers or distant audio without distortion.
Low-Noise Design: MAX4466 IC with chopper-stabilized architecture minimizes hiss and hum, ensuring clean preamp performance.
Integrated Microphone Bias: Powers standard electret mics (2V bias) directly—no external components needed.
Rail-to-Rail Output: Maximizes dynamic range for direct connection to ADCs or audio interfaces.
Compact and Solder-Friendly: Black PCB with labeled pins (e.g., “DCB-5V,” “GND”) for quick prototyping in breadboards or enclosures.
Power-Efficient: Draws minimal current, suitable for battery-powered voice recorders or IoT devices.
Applications:
DIY audio recording and podcasting setups.
Voice recognition systems for smart home or robotics.
Noise monitoring or environmental sound sensors.
Arduino/Raspberry Pi microphone interfaces.
Portable audio gadgets and wearable tech.
Note: Pair with a compatible electret microphone (not always included) and avoid exceeding 5V input to prevent damage.
