an ear to your project with this -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 MAX4466, an op-amp specifically designed for this delicate task The amplifier has 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 . 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 inch ) which is good for attaching to something that expects ' level' input without clipping, or up to about 1Vpp, Perfect for reading from a microcontroller . 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 , 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 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 the smallest in-ear headphones - you'll need an audio amplifier (such as 3.7W stereo amp) if you to connect the amp directly to speakers. If you're connecting to a microcontroller pin, you 't need an amplifier or decoup capacitor - connect the OUT pin directly to the microcontroller pin. For audio-reactive projects, we suggest using an driver library which can take the audio input and 'translate' it into frequencies. colour: purple Material: plastic Package Contents: 1 X Electret Microphone Amplifier MAX4466 Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.