2PCS DC 3-5V Electret Microphone Preamplifier Module with Voice Compression Amp Sound Amplifier Board Adjustable 5-30db
The polarizer microphone amplifier board adopts the original polarizer amplifier 721 chip, and the gain can be adjusted by the resistance of the adjustable resistor on the board. This is only a small signal amplifier and cannot directly drive the speaker. An amplifier needs to be added.
Working voltage: DC 3-5V
The gain can be adjusted within a range of 5-30dB, flexibly adapting to different scene requirements.