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Same ground, different voltages?
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TheShaner:
I am wiring up my buttons and some LED's inside of a cocktail I am working on.  The buttons are obviously wired to an iPac, the lights are getting power from a power plug coming off of the Power Supply of the computer.  Some of the lights (buttons) are running at 5v, and some of the lights (internal and under the cabinet) are running 12v.  Can I use the same ground across the board?  Or will I need to use the ground from the iPac for the buttons, the 5v ground for the 5v lights, and the 12v ground for the 12v lights? 
SgtSlaughter:
I was wondering this myself, whether the 2 black wires were meant for 12v and 5v grounds, but everywhere I read said you can use them inter changeable.  The only downfall with running everything daisy changed is should a charge go through you have more change to fry multiple devices (at least thats what I understand).

I do think it probably is best practice to have your lights grounded seperately from your lights though.
mgb:
If you meter the two black commons for continuity, do they ring out as being electrically the same?
Nephasth:
Ground is ground is ground.
matsadona:
Exactly, for a PC PSU all voltages share the same ground.

If you want the wiring more convenient you could add an extra resistor for the 5V LED's, and run everything at 12V.
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