3Pcs CJMCU-4466 MAX4466 Electret Microphone Adjustable Amplifier CMA-4544PF-W

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 isnt nearly as noisy This is best used for projects such as voice changers audio recordingmpling 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 Thats 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 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 youre using requires AC coupled audio place a 100uF capacitor between the output pin and the input of your device If youre connecting to an audio amplifier that has differential inputs or