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December 13, 2018 
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Howto : Make a 7/12V fan switch

  



Article by : SpotTheCat
I made this, it's better than a rheostat/baybus because those produce heat, cost more money, and can't handle big fans. I went to my hardware store and bought a 3way lightswitch for $1.20, cut a hole in a 5.25" bay, and mounted it. The wiring is slightly complex, Here's how I made it :

Yellow - always +12V
Black - either ground or +5V, depending on switch position
Black - always ground
Red - always +5V


Here are some pics I whipped up, click on the image for a bigger picture


How it works: when the switch has the negative fan lead at ground, the total voltage is 12-0=12V when the negative fan lead is at +5 you get a resultant of 12-5=7V

You can have fans always 7 or always 12 by moving the pins on the molex connecters to the always 5 or always ground leads


Thanks go out to SpotTheCat for providing us with this howto and pictures!
  

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