Pioneer 300W amplifier circuit is working with symmetric 45v DC +-power transistors MJ15003, the NPN transistors, can be used in all MJ11016 2N3773 4 ohm speaker with 300 Watts of power. Driver card schema, pcb drawings and proteus isis... Electronics Projects, Amplifier Circuit Pioneer 300W "audio amplifier circuits, transistor amplifier, " Date 2019/08/03