Electret Microphone Amplifier Module MAX4466 Adjustable Gain GY-4466 CMA-4544PF W Item Type: Microphone Amplifier Module Description: 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. Has excellent power supply noise suppression 4. Most suitable for projects using FFT, such as voice converters, audio recording / sampling and audio response projects 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 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 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! Use: 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