Add an ear to your project with this well-designed electret microphone
amplifier with AGC. This fully assembled and tested board comes with a
20-20KHz electret microphone soldered on. For the amplification, we
use 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 & 'clip'
the amplifier, and even quiet, far-away sounds will be amplified. 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 ouput 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 1uF blocking capacitor in series.
For audio-reactive projects, we suggest using an FFT driver library
(such as the one in this library)  which can take the audio input
and 'translate' it into frequencies.
Each order comes with one assembled and tested board, with electret
mic pre-soldered on, and a small piece of header. Our tutorial will
get you started with using and testing the microphone amplifier 
http://learn.adafruit.com/adafruit-agc-electret-microphone-amplifier-max9814/ … more
If you wish to learn more about this product, please visit the manufacturer's website or contact us: email@example.com
Warranty 24 month Bring-in
Limited right of return
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