360 Watt Amplifier using MOSFET

The output power is 360 Wrms under 8 ohms or 550 Wrms under 4 ohms. Distortion is lower than 0.02 percent.

Damping factor is better than 400, signal-noise ratio is 112 db (balanced A at full power), the input sensitivity is 1,2 volts (360 W under 8 ohms). I propose here a more powerful version of the 200 Wrms 8 ohms AB class power amplifier project. It shares the same concept that the less poweful model : assembled using common compoments (not very expensive), based on traditional diagrams : a symmetrical differential input stage, a cascode stage driver and a MOSFET output stage.

The printed circuit board is very compact , and is composed of two subsets : the command stage and the output stage. Constant current sources of +/- 1 mA are formed around T5 and T6. The diodes D1 to D6 allow the use of low noise transistors type BC550C and BC560C, the transistors T7 to T10 form the stage driver. The potentiometer P1 allows the adjustment of the quiescent current to 100 mA per output transistor.