There BA3121 noise reduction circuit using LC filter circuit design, two imports 8200uf wave filter capacitor.
common mode inductance LC filter design, more efficient filter out interference caused by power supply.
This chip board without the amplifier chip, other parts have been assembled, to buy back as long as the installed power amplifier chip can be used with TDA7850,7388,7854 etc. (25 pin chips can be used directly with A is 27 feet can not be used )
Operating voltage: DC 10V-15V
Channel: Channel 4
Board size: 100mm X 50mm