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I need to drop the 12v or 5v voltage from a PC's PSU (in the case) down to 4.5v and 3v (two separate items)? Answered


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3v regulator and 5v regulator with a small resistor

Two, LOW DROP OUT regulators, off the 5V line.

You need to do this or you want to? What needs powering?

L

Two separate voltage regulators.