Sorry for not replying to you sooner, I've been working away.
Just wanted to say thank you and superb post.
Carried this out on a UK 60GB PS3, works superbly using 2 x 500k pots.
Respect for sharing the info
QUOTE(desicrator @ May 22 2010, 08:24 PM)
Personally i used 2 500k slider potentiometers.
I was able to fit these into a 40gb console on the right(perfect size for screwing it to the casing), I used a 2.2M linear on a 60gb console, in order to fit it in as the motherboard is larger, i had to cut out 1 of the screw base just behind where the usb ports are. i then drilled a holed out which was able to fit the knob for the pot.
These are all that i have been able todo so far. but on the 60gb i am unable to get very controllable speeds. as when turnin it even slightly rapidly slow the fan speed to almost off. using the 2 slider version i found i could use the second pot for full range of speed.
ALSO i forgot to mention that this does not affect the voltage going to the fan, the fan runs on 12v constantly, its managed by a PWM wire(USUALLY GREY) which is what you attach the output to.