Last summer when I was in the process of building my computer, I picked up a fan control switch from Nerdsbyte. It is a high-off-low toggle affair. (12v and 7v)
I never used it. I recall reading that the method in which the 7 volts are derived here is down and dirty. Something about using two negatives to get the 12 volt rail down to 7v using the 12v negative and 5v negative lines, I think.
To be clear, I have not trashed anything and have no argument with Nerdsbyte.
What I need here is a slight refresher on the subject, since I don't want to throw an imbalance into the power supply and cause a problem with voltages and my rig.
We got 12, 3.3, and 5 volts coming out of the power supply, so I am certain the 7 volts is begin pulled in a abnormal way.
I am sure I have 12v and 7 v out the device after checking with a VOM.
Anyway, let me know what you think, I may be better to off get a potentiometer, if I knew what to get and where. I will be using this to adjust speeds on two Panaflo 120 mm 12M's.
I also noticed after visiting Nerdsbyte's site, that this switch is no longer available.
Thanks much,
Jim