Quote: Originally Posted by walid_bmw
because, theoretically, doesnt the ac power supply take the 110Ac, convert it to 12v dc, then 5v dc then 3.3 v dc?
Yes, kinda. The 5v and 3.3v is not usually derived from the 12v. They usually have separate secondary windings on the main switching transformer.
Quote: Originally Posted by walid_bmw
so what i could do is wire the 12v regulator to the output of the transformer that changes the ac to 12v dc thereby canceling out that transformer??
Nope. The transformer doesn't change 110ac to 12 dc. The combination of the primary bridge rectifier, primary switching transistors, main transformer, rectifiers, and the associated feedback loop converts the 110ac to the DC supply your PC needs. There is a lot more to a power supply than a transfomer, as I'm sure you know (having had it apart). The regulator loop in these supplies is a switching feedback loop that controls the primary switching transistors on the transformer. Do some research on transfomers and switched mode power supplies.
Quote: Originally Posted by walid_bmw
thanks a lot and please dont laugh....
Ok
Rob
__________________
6yr old first install died 20/8/2005 as result of bad bios flash.
New system : 6x5x2" contains 1GHz C3 PCM9373, ISR based PSU, 8Gb flash DOM, 98Lite, DirectShow based frontend.
GPS : Rikaline 6010.
Display : LTM08C351 + LVDS receiver.
Linear Mode
