12v psu supply - SO MANY WIRES!

I need a 12v DC power source from a ATX PSU but not as lab bench supply. Just a 12v supply. I saw a video in which the maker connected green and black. Done that and why. But then he bundled all the yellows (12v) together and crimped a connector at the end. He then did the same with all the blacks.

That is a lot of black wires and unwieldy. Do I need all of them? What about the yellows? I see other hacks where only one or two were used for a bench supply.

by DSpooger
December 15, 2018

1 Answer

Answer by mikerogerswsm

Depends how many amps you want to take. If 100mA then one pair of wires will do. If 1A or greater you need to think of current density and of wire resistance and voltage drop.

+1 vote
by mikerogerswsm
December 16, 2018

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