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Adjustable Supplies in the 10-11 amp range

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Frst sory for my englis end look at this a am bild this end shis work fine.
 

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The BD250 transistor will melt if the input to output voltage exceeds only 5V when the output current is 20A.
How will you cool it?? Liquid nitrogen?
 
Just build the schematic I have Maletaski.
Except for the r1 and r3 values being completely wrong, it works well :)
 
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