My simple fan controller

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

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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:
[url=]Antec 302-S Project[/url]
[url=]Solo PC with flipped PSU & Mobo[/url]
[url=]Basement PC flipped and converted[/url]


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

Nicely done!

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

Nice :)
Main/gamming : Antec Solo|X-650|Asus P5Q-E|Intel Q9550@3.4GHz|HR-01 Plus 120mm Nexus @6V|Corsair 2x2Go XMS2 DHX cas 4 @4-4-4-12|Exhaust Nexus 120mm @9V|Intel X25M G2 160Gb|Samsung 1TB in SQD|2xGigabyte GTS450 OC (@900/1900/3800)|GPU fan 120mm Nexus @6V
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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.
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