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【ELECTROACOUSTIC PERFORMANCE】20 20KHz electret microphone is welded on the audio component amplifier module board ,the electret microphone is small in size ,simple in structure ,and good in electroacoustic performance 【STABLE PERFORMANCE】The pin has good contact performance to ensure stable work and can be connected to 2 . 4 5VDC 【SUPPRESS POWER SUPPLY NOISE】The electret microphone uses the operational amplifier MAX4466 designed specifically for amplifiers ,which has good power supply noise suppression capabilities 【GAIN ADJUSTMENT】The audio component amplifier has a small trimming potentiometer on the back to adjust the gain ,the gain can be set from 25 times to 125 times ,as low as about 200mVpp (usually about 6 inches away) 【APPLICATION】Electret microphone amplifier is very suitable for projects that use FFT ,such as voice converters ,audio recording amplifiers and audio response projects