OK. PWM fan's have a PWM circuit in them that translates the frequency and controls the fans with it. It has nothing to do with the 12v line. That's why pwm is effecient. The most rudimentary PWM circuit is generally made with a 555 timer, an LM393 comparator, resistors, capacitors, and a pot, i don't know how describing that as electronics is incorrect.
And you pretty much just told me that it's not a voltage regulator, it just regulates the voltage. I don't know what fan controller he has. I've read thread after thread about people overloading fan headers because when you lower the voltage it adds heat to whatever YOU would like to call the non voltage regulators that regulate the voltage. If you've ever read a review on the Aquaero, it's pretty much mandatory that you buy a waterblock for it if you wanna load up the fan channels. I'm not an engineer. But i know that when you undervolt your fans, you don't wanna have too many on a channel.
"And the next bad thing where I am also 99% sure is your fan channel #2. This behavior normally happens when the voltage regulator got damaged by a short circuit or overload. It can be fixed by swapping the voltage regulator."
That's quoted from Shoggy of the Aquacomputer staff
BTW, he's describing the Aquaero 5 there, which is..........a........fan controllerEdited by kpoeticg - 8/21/13 at 4:16pm