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. 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.
Technical Details
Datasheets/MAX4465-MAX4469.pdf
1063 - Electret Microphone Amplifier - MAX4466 with Adjustable Gain
- Brand: Adafruit
- Product Code: ES001810
- Availability: In Stock
-
6.95€