Pretty strong BJT transistors (2SA1943 pnp 2SC5200 NPN) based on an amplifier circuit output can be used in the lowest speaker ohmic the 2ohm 4ohm with a 450watt 8ohm with a 260watt power gives the operating voltage symmetrical +... Electronics Projects, Leach 700 Watt Power Amplifier Circuit 2SC5200 2SA1943 PCB "audio amplifier circuits, transistor amplifier, " Date 2019/08/03