Adafruit Electret Microphone Amplifier with Adjustable Gain

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Adafruit Electret Microphone Amplifier with Adjustable Gain

PRODUCT DESCRIPTIONS:

Adafruit Electret Microphone Amplifier with Adjustable Gain is fully assembled and tested board comes with a 20-20KHz electret microphone soldered on. For the amplification, the Maxim MAX4466 is used, an op-amp specifically designed for this delicate task. The amplifier has excellent power supply noise rejection, so this amplifier sounds really good and isn't nearly as noisy or scratchy as other mic amplifiers breakouts are tried. Small trimmer pot on the back to adjust gain (25x to 125x). This breakout is best used for projects such as voice changers, audio recording/sampling and audio-reactive projects that use FFT. On the back, a small trimmer pot is also included 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 inches 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 the "quietest" supply available (on an Arduino, this would 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). Connect the OUT pin directly to the microcontroller ADC pin. It is RoHS compliant.

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