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Adafruit Industries LLC
Electret Microphone Amplifier MAX4466 with Adjustable Gain
Adafruit Industries LLC
Electret Microphone Amplifier MAX9814 with Auto Gain Control
 
Adafruit Industries LLC
MP34DT01-M MEMS Omnidirectional Microphones Audio Evaluation Board
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Electret Microphone Amplifier MAX9814 with Auto Gain Control

Electret Microphone Amplifier MAX9814 with Auto Gain Control

Adafruit Industries LLC

This fully assembled and tested board comes with a 20-20KHz electret microphone soldered on. For the amplification, it uses the Maxim MAX9814, a specialty chip that is designed for amplifying electret microphones in situations where the loudness of the audio isn't predictable. This fancy microphone amplifier module is a step above the rest, with built in automatic gain control. The AGC in the amplifier means that nearby 'loud' sounds will be quieted so they don't overwhelm and 'clip' the amplifier, and even quiet, far-away sounds will be amplified.

Product Description

This amplifier is great for when you want to record or detect audio in a setting where levels change and you don't want to have to tweak the amplifier gain all the time. The chip at the heart of this amp is the MAX9814, and has a few options you can configure with the breakout. The default 'max gain' is 60dB, but can be set to 40dB or 50dB by jumpering the Gain pin to VCC or ground. You can also change the Attack/Release ratio, from the default 1:4000 to 1:2000 or 1:500. The output from the amp is about 2Vpp max on a 1.25V DC bias, so it can be easily used with any Analog/Digital converter that is up to 3.3V input. If you want to pipe it into a Line Input, just use a µF blocking capacitor in series.

Specifications
  • Function:Microphone Amp
  • Primary Attributes:Automatic Gain Control (AGC)
  • Supplied Contents:Board(s)
  • Type:Audio
  • Utilized IC / Part:MAX9814
Parts
Associated Product
Maxim Integrated Class AB Amplifier
Category: Semiconductors, Development Tools-Integrated Circuits (ICs)-Linear-Amplifiers-Audio Amplifiers-Class AB-1-Channel (Mono)