how to control a computer fans speed and turn it into a desk fan.
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Step 1: Get power source

Picture of get power source
you will need to get a model train transformer. just make sure it's 12 volts.

Step 2: Alligator clips

Picture of alligator clips
hook the alligator clips to the silver screws

Step 3: Hook up fan.

Picture of hook up fan.
hook the alligators to the fans wires.

Step 4: Stick fan on transformer

Picture of stick fan on transformer
stick fan on transformer

Step 5: Plug it in

plug it in and turn the knob. if you like it don't forget to rate!
carmaster4 years ago
Oh man, that transformer is the exact one I have from the hobby train I had since 15 years ago.

wow, memories.
sdallesasse6 years ago
Good Instructable. However you may want to get some clearer pictures.
devicemodder (author)  sdallesasse6 years ago
thanks for the comment! all that i had was a 3.1 megapixel camera.
 You can take clear pictures with a 3.1MP camera, my camera is only 5.2MP, only about 2 more MP than your camera, yet it takes SURPRISINGLY clear pictures at high resolutions. Perhaps you just need to learn how to properly use a digital camera?
threewheela5 years ago
 ha ha cool. i have that same transformer.

mrbobdog7075 years ago
This is great and simply idea, thank you for this Instructable was looking for a way to controller the speed of my fans for entertainment cabinet, and this looks the best solution so far.
devicemodder (author)  mrbobdog7075 years ago
your welcome
billdan6 years ago
It is much simpler to install speedfan and it is free. You can set the temps of components such as the cpu which is very critical to keep properly cooled. You can monitor voltage requirements and control three fans automatically based on the operating temperature you specify ie.. high temp setting to start the fan and what rpm you want which keeps the fan noise down. I have used it for a couple years since my cpu went up in flames. Now my system is water cooled and has extra fans and I can monitor the temps,good luck
Xamith billdan6 years ago
unless your using linux...
devicemodder (author)  billdan6 years ago
this sits on your desk
cool idea....
shooby6 years ago
This is simple, but a really good idea. Those transformers aren't difficult to come by at all. It's also great to be able to know that your computer is staying cool, without having to always have the fan blasting, because if you're just typing or listening to music, an auxiliary fan at full power can be overkill.