Using the MAX4466, an op-amp specifically designed for amplifier, which has power supply noise rejection, and the board comes with a 20-20KHz electret microphone soldered on.On the back, we include a small trimmer pot to adjust the gain.<br> Power supply voltage: +2.4V to +5.5V (can be compatible with for , for and other development board motherboards); Power supply rejection : 112dB; Common mode rejection : 126dB; AVOL: 125dB (RL = 100k) rail-to-rail output; Quiescent power supply current: Less than 24A; Gain bandwidth: 600kHz. The output is rail-to-rail so if the sounds gets loud, the output can go up to 5Vpp!<br> Applications: This breakout board is best used for projects such as voice changers, audio recordingmpling, and audio-reactive projects that use .<br> Note:For the best performance, use the "quietest" supply available (on an for , this would be the 3.3V supply); For audio-reactive projects, we suggest using an driver library which can take the audio input and 'translate' it into frequencies.<br> The MAX4466 is a micropower operational amplifier optimized for use as a microphone preamplifier. They an perfect combination of optimized gain-bandwidth and supply current, as as low-voltage operation in super packages.<br> <br> Color: purple<br> Material: PCB+metal<br> Using introduction:<br> Connect GND to ground, VCC to 2.4-5VDC.<br> The audio waveform will come out of the OUT pin. The output will have a DC bias of VCC/2 so when perfectly quiet,<br> the voltage will be a steady VCC/2 volts (it is DC coupled).<br> 1.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.<br> 2.If you're connecting to an audio amplifier that has differential inputs or includes decoupling capacitors, the 100uF cap is not required.<br> 3.If you to connect the amp directly to speakers. If you're connecting to a microcontroller pin, you 't need an amplifier or decouplingcapacitor - connect the OUT pin directly to the microcontroller pin.Note: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)For audio-reactive projects, we suggest using an driver library which can take the audio input and 'translate' it into frequencies.Applications:It is widely used in Cellular phone, Digital repeater, Headphones, Hearing aids, Microphone preamplifier, Portable computer, Speech recognition system . Package Contents:5 x MAX4466 Module(Due to the computer display, the color of the product may be different from the )5 x Pin<br> 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.