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please help make a variable power supply


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Hi folks,
I read through the article below describing how to make a lab power supply from an PC ATX power supply.  The link is here:


I would like to make this a variable power supply that can generate the full rated amperage.  I will need about 12V and up to 10A on the 12 V setting and up to 25A on the 5V setting.  I am extremely electronically challenged so please be as explicit as possible using laymans terms.  Thanks.

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