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10A 1.2 to 20V power supply


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How are you going to cool the MJ15004 power transistor when it must dissipate 313W??
It will melt. You will need many power transistors mounted on a huge heatsink and a high velocity fan.

The 25VAC transformer produces a peak voltage of 35.4V. The rectifier bridge will make a voltage of 33.4VDC. When the output voltage is turned down to 1.2V then the MJ15004 power transistor will have 32.5V at its emitter and 1.2V at its collector and 9.5A through it. Its power dissipation will try to be (32.5V-1.2V) x 10A= 313W.

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