1.This carefully designed electret microphone amplifier can add a lot to your project 2.Fully assembled and tested circuit board with soldered 20-20KHz electret microphone 3.The product has excellent power supply noise suppression 4.Suitable for voice converters, audio recording sampling and audio response projects 5.On the back, we include a small trimmer potentiometer to adjust the gain Item Type: Microphone Amplifier Module_x005F_x000D_ _x005F_x000D_1. This carefully designed electret microphone amplifier can add a lot to your project_x005F_x000D_2. Fully assembled and tested circuit board with soldered 20-20KHz electret microphone_x005F_x000D_3. Has excellent power supply noise suppression_x005F_x000D_4. Most suitable for projects using FFT, such as voice converters, audio recording / sampling and audio response projects_x005F_x000D_5. On the back, we include a small trimmer potentiometer to adjust the gain. You can set the gain from 25 times to 125 times_x005F_x000D_6. Drop to about 200mVpp (normally, about 6 inches away), ideal for connecting to something that requires "line level" input without clipping, or up to about 1Vpp_x005F_x000D_7. Very suitable for reading from microcontroller ADC. The output is rail-to-rail, so if the sound gets louder, the output can reach 5Vpp!_x005F_x000D_Use: _x005F_x000D_Connect GND to ground and connect VCC to 2.4-5VDC. For best performance, use the quietest power supply available. The audio waveform will be output from the OUT pin. The output will have a DC bias of VCC / 2, so when it is completely quiet, the voltage will be a stable VCC / 2 volts (DC coupled). If the audio device you use requires AC-coupled audio, place a 100uF capacitor between the output pin and the input of the device. If you are connecting to an audio amplifier with a differential input or including decoupling capacitors, you do not need a 100uF capacitor._x005F_x000D_The output pins are not designed to drive speakers or the smallest in-ear headphones, but to connect them directly to the speakers, so you need an audio amplifier (for example, a 3.7W stereo amplifier). If connected to a microcontroller pin, no amplifier or decoupling capacitor is needed-connect the OUT pin directly to the microcontroller ADC pin 1 xMicrophone Amplifier Module