Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Chip Model	MAX9814
Operating Voltage	2.7V to 5.5V DC
Gain Control	Automatic Gain Control (AGC)
Gain Range	40dB / 50dB / 60dB selectable
Attack Time	10ms typical
Release Time	Ratio 1:4000 typical
Output Type	Analog Audio Signal
Microphone Type	Electret Condenser (included)
PCB Dimensions	16mm x 13mm
Application	Voice Recognition, Recording, Sound Detection

6 reviews

Anonymous

Mar 29, 2026

Rating: 4/5

Good for learning electronics

Bought this for a university project. Documentation online is plentiful, and the module performed exactly as described in the datasheet.

Anonymous

Mar 26, 2026

Rating: 4/5

Great value, minor noise floor

For the price, this module is unbeatable. The automatic gain is smooth. There is a slight hiss when no sound is present, but it's acceptable for hobbyist applications.

Anonymous

Mar 26, 2026

Rating: 5/5

Perfect for Arduino voice projects

The AGC feature works flawlessly. Whether I whisper or speak loudly, the output volume remains consistent. Very easy to interface with my microcontroller.

Anonymous

Mar 21, 2026

Rating: 5/5

Compact and reliable

Used this in a small robot for voice command detection. The size is perfect, and the soldering pads are well-spaced. Highly recommended.

Anonymous

Mar 13, 2026

Rating: 5/5

Easy to configure gain

I appreciate that you can select between 40, 50, or 60dB gain by bridging different pads. Makes it versatile for different environments.

Anonymous

Mar 12, 2026

Rating: 5/5

Excellent dynamic range handling

The attack and release times are well-tuned. It handles sudden loud noises without clipping too harshly. Great little sensor.

5 FAQ

Q: Can I use this with a 3.3V microcontroller like ESP32?

A: Absolutely. The MAX9814 operates from 2.7V to 5.5V, making it fully compatible with 3.3V logic systems.

Q: Is the output digital or analog?

A: The output is an analog audio signal. You will need an ADC (Analog-to-Digital Converter) on your microcontroller to process the data digitally.

Q: Does this module come with a microphone attached?

A: Yes, the module includes a small electret condenser microphone soldered directly onto the board.

Q: What is the frequency response range?

A: The module is optimized for voice frequencies, typically covering roughly 100Hz to 10kHz, which is ideal for speech recognition and sound detection.

Q: How do I change the gain setting?

A: There are three pads on the PCB labeled GAIN. You need to solder a bridge between specific pads to select 40dB, 50dB, or 60dB. Please refer to the pinout diagram in the product manual.

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