The edited versions of the Holy Holton AVXXX series amplifier circuits are of high quality PCB designs. The power transistors of the 400W Amplifier circuit are BJT 2SC5200, 2SA1943, or Mosfet IRFP240, IRFP9240 can be used for this and... Electronics Projects, Amplifier Circuits 800W 400W "audio amplifier circuits, transistor amplifier, " Date 2019/08/04