i have an old pc power supply and i want to make it into a bench power supply so i can have a bench power supply that can do high current

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the plan is to make it have 4 out puts:

• 12v
• 5v
• 3.3V
• 3.3v and a boost converter to boost to really high voltage

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input:
it will be controlled by a rotary encoder because it has all the inputs i need for this in one component

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display:
it will use an lcd display because i already have one. i want to display current draw voltage and wattage

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brain:
i am going to use a nano becouse i have a few of them and it is small so it should fit in this small thing

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outputs:
i am going to output with banana jacks so i can easily plug stuff in to it and i am going to add leds so you know what out put you are monitoring

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case:
it is a frame that goes around the cornors of the power supply while keeping it open to alow air flow then the face hold the power supply in with screws