Adafruit Electret Microphone Amplifier with Adjustable Gain

Add an ear to your project with this well-designed electret microphone amplifier. This is a fully assembled and tested board.  For the amplification, Adafruit used the Maxim MAX4466, which is an op-amp. The amplifier has excellent power supply noise rejection, so this amplifier sound is clear and isn't nearly as noisy or scratchy as other mic amp breakouts.This breakout is best used for projects such as voice changers, audio recording/sampling, and audio-reactive projects that use FFT. On the back, we include a small trimmer pot to adjust the gain. You can set the gain from 25x to 125x. That's down to be about 200mVpp (for normal speaking volume about 6" away) which is good for attaching to something that expects 'line level' input without clipping, or up to about 1Vpp, ideal for reading from a microcontroller ADC. The output is rail-to-rail so if the sounds gets loud, the output can go up to 5Vpp.Using it is simple: connect GND to ground, VCC to 2.4-5VDC. For the best performance, use