My simple fan controller

Control: management of fans, temp/rpm monitoring via soft/hardware

Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Lawrence Lee

Post Reply
Posts: 307
Joined: Fri Sep 19, 2008 1:39 pm
Location: Toronto, Canada

My simple fan controller

Post by speedkar9 » Sun Jul 25, 2010 7:23 pm

After fiddling with many PWM and voltage controllers based on a timer circuit and potentiometer input, I decided to go back to basics to control my AC PWM CPU and Exhaust fans in my Solo.

I simply used a 3 position toggle switch and some 1N4002 diodes in series to reduce the fan's voltage. An RPM header allows me to route the yellow wire back to the motherboard for speed monitoring.

Fan controller

Toggle switch mounted out back (The second toggle switch controls diode 6(CPU Fan); optional)

Simple Schematic:

Posts: 279
Joined: Tue May 05, 2009 1:15 am
Location: Sydney, Australia

Post by ascl » Mon Jul 26, 2010 3:22 am

Nicely done!

Friend of SPCR
Posts: 1346
Joined: Tue Jul 08, 2008 4:53 am
Location: CT

Post by frenchie » Mon Jul 26, 2010 5:21 am

Nice :)

Posts: 38
Joined: Mon May 24, 2010 11:21 am
Location: Atlanta

very nice

Post by joetekubi » Fri Jul 30, 2010 4:13 am

great writeup and documentation.
Should become a sticky here.
Lots of people get hung up on resistors and power dissapation in fan control, but diodes and switches make a lot of sense.

Post Reply