An old design even in the quite solid and powerful MOSFET amplifier circuit circuit operating voltage symmetrical + -40 volts DC at the output of two MOSFETs used irf240 and irf9240 Hi fi amp circuit PCB design, layout in... Electronics Projects, Hi Fi Power Mosfet Amplifier Circuit 160 Watt "audio amplifier circuits, transistor amplifier, " Date 2019/08/03