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Potentiometer Help!!

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Ray450R

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My source is 12v and i want to step it down to 3v and back to 12 using a potentiometer. Is there anyone that can tell me the ohm potentiometer that i need? Thanks
 
My source is 12v and i want to step it down to 3v and back to 12 using a potentiometer. Is there anyone that can tell me the ohm potentiometer that i need? Thanks
How much current do you need?
 
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