I currently have an Athlon XP computer system. This system is great with the exception of the CPU fan. There are two major problems with it, it is very noisy and the "pitch" of the fan often changes, I suspect this is due largely to slight voltage fluctuations.
The fan is rated at 12V, .16A and 1.92W Min voltage is 7V
What I'd like to do is drop the voltage a little, say to about 9.5-10v and add a capacitor to the line to smooth out the voltage.
If I understand V=IR correctly, I need a 150 Ohms 1/2 W resistor to do the voltage drop. Can someone confirm this?
What I do not know is how to select a capacitor to quite the line. I suspect I need something pretty small, but again I have no idea how to calculate the value.
Thanks for any input.
PS: I am aware to dropping the voltage on the CPU fan will reduce cooling efficiency. I'm not really worried about it.