Output 500 Watt Mono Amplifier MJ15003 NPN transistors used in the power supply voltage of the circuit Maxi + – a total of 120 volts to 60 volts be careful half-200w-300w-400w with a few changes you can use as... Electronics Projects, 200W 300W 400W 500W Amplifier Circuit "audio amplifier circuits, transistor amplifier, " Date 2019/08/01