um, your probably gonna want a 3.3v or 5v supply to power leds (w/ some resistors to control current to them). And if you were really interested in adding lights, you'd open the PS3 and start measuring voltages, looking for some voltage regulators.
... if you really want lights that bad, you can power some from your usb ports w/o even opening your PS3..lol
you could use 5v easily. Basic ohms law... E = I x R.
if you wanted to use 10ma:
5 = 0.010 x R
R = 500 ohms
if you wanted to use 15ma:
5 = 0.015 x R
R = 333 ohms
.. ect. Using the USB ports wouldn't really be ideal, since i doubt you want stuff hanging off the ports.. it was more of a joke. If you really wanted to add LEDs to your PS3, and you have basic electronics skills, it would be really easy to just open the PS3 up look for some IC's, voltage regulators, ect and measure the voltage. Figure out the resistors needed using ohms law, and do your mod.
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Originally Posted by xtrem 
