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speedkar9
 Post subject: My simple fan controller
PostPosted: Sun Jul 25, 2010 7:23 pm 
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Joined: Fri Sep 19, 2008 1:39 pm
Posts: 307
Location: Toronto, Canada
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
Image

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

Simple Schematic:
Image

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ascl
 Post subject:
PostPosted: Mon Jul 26, 2010 3:22 am 
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Joined: Tue May 05, 2009 1:15 am
Posts: 278
Location: Sydney, Australia
Nicely done!
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frenchie
 Post subject:
PostPosted: Mon Jul 26, 2010 5:21 am 
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Joined: Tue Jul 08, 2008 4:53 am
Posts: 1263
Location: CT
Nice :)

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joetekubi
 Post subject: very nice
PostPosted: Fri Jul 30, 2010 4:13 am 
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Joined: Mon May 24, 2010 11:21 am
Posts: 38
Location: Atlanta
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.

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