# Could someone help me?

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Anonymous
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Hi all, i've just started a computer course [i have built systems in the past, but i need a piece of paper that say's i can] but i'm a little stuck. The question is,
Detail the voltages present on a large disk connector?
o yeah i really think i may need some more help with this course, so i might be posting quite a lot.
Any help is appreciated.

Yellow = +12v
Red = +5v
2x Black = Ground

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a b à CPUs

I assume you mean a molex connector? The type used to connect hard drives, cd-rom,floppy, etc.That one is simple.
red=+5
black=-5
black=-12
yellow=+12
I'm not sure about the voltages present in the 40 or 80 connector ribon cables.never checked.

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R U sure the 2 blacks are -12 and -5?

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The 2 blacks are definitely supposed to be ground.

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a b à CPUs

yes. we are talking about DC current on this side of the power supply.AC in and DC out. Yes it is a ground of sort, BUT the two should not be swapped. That is why it is allways written as -5 or -12, not ground.Your power supply has different regulator circuits for each voltage. Crossing the two can cause all sorts of problems.

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a b à CPUs

I understand your point about not switching them, as each cicuite has it's own protection on some suplies, but they are still zero-volt. They could be deditcated to that line, but since the positive side is the only one that is diferentiated from the case, the black wires should have a common ground.

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