❥Advantage: Ultra-small volume dynamic microphone preamplifier board,two-channel design,suitable for a single lithium battery-powered ❥Advantage: using AD828 fever op amp chip,suitable for low voltage power supply (3.7-15V) ❥Note: This microphone amplifier board without power regulator circuit,can only use the battery or linear power supply,can not use switching power supply,otherwise there will be interference ❥Note: If you only used one channel,the other channel needs to short-circuit the input with GND,To avoid interference with the signal crosstalk ❥Package include: 1x AD828 Stereo Dynamic Microphone Preamplifier Board