Adafruit Electret Microphone Amplifier – MAX4466 with Adjustable Gain [ADA1063]

Add an ear to your project with this well-designed electret microphone amplifier. This fully assembled and tested board comes with a 20-20KHz electret microphone soldered on. For the amplification, they use the Maxim MAX4466, an op-amp specifically designed for this delicate task! The amplifier has excellent power supply noise rejection, so this amplifier sounds in reality good and isn’t nearly as noisy or scratchy as other mic amp breakouts they have tried! This breakout is best used for projects such as voice changers, audio recording/sampling, and audio-reactive projects that use FFT. On the back, they include a small trimmer pot to adjust the gain. You’ll 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! The use of it is simple: connect GND to ground, VCC to 2.4-5VDC. For the best performance, use the “quietest” supply to be had (on an Arduino, this will be the 3.3V supply). The audio waveform will come out of the OUT pin. The output will have a DC bias of VCC/2 so when its perfectly quiet, the voltage will be a steady VCC/2 volts (it is DC coupled). If the audio equipment you’re The use of requires AC coupled audio, place a 100uF capacitor between the output pin and the input of your device. In case you are connecting to an audio amplifier that has differential inputs or includes decoupling capacitors, the 100uF cap is not required. The output pin is not designed to drive speakers or anything but the smallest in-ear headphones – you can need an audio amplifier (such as their 3.7W stereo amp) if you wish to connect the amp directly to speakers. In case you are connecting to a microcontroller pin, you are not looking for an amplifier or decoupling capacitor.

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Small trimmer pot included to adjust the gain from 25x to 125x
Best used for projects such as voice changers, audio recording/sampling, and audio-reactive projects that use FFT
Excellent power supply noise rejection
Fully assembled and tested