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Description:
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, we 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 really good and isn't nearly as noisy or scratchy as other mic
amp breakouts we've 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, 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 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). If the audio equipment you're using requires AC coupled audio,
place a 100uF capacitor between the output pin and the input of your
device. If you're 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'll need an audio amplifier (such as
3.7W stereo amp) if you want to connect the amp directly to speakers. If
you're connecting to a microcontroller pin, you don't need an amplifier
or decoupling capacitor - connect the OUT pin directly to the
microcontroller ADC pin.
For
audio-reactive projects, we suggest using an FFT driver library which
can take the audio input and 'translate' it into frequencies.