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Picture of DIY PC Fan Controller STW Maybe
Picture of DIY PC Fan Controller

This instructable should help you build a simple 3 speed fan controller for any 12v dc computer fan. I couldn't find a decent tutorial on fan controllers so i've made this simple one. This is my first Instructable so I hope it's alright :)
Please comment


I can't be held responsible if you break stuff, i have tried to describe things as thouroghly as possible but if stuff breaks it's your fault not mine . None of my stuff broke


The 3 speeds will be off, half speed and full speed
Being able to turn case fans off helps you keep your computer quiet when you don't require the extra cooling, the two fan speeds allow you to turn the fans up when necessary and dow to keep the system quiet while still cooling


You will need:

DC fans - I used 2 i bought on Ebay for about £1.50 each from China, they came with 2 wires for power(+/-) Not PWM 3 pin/wire type and a molex plug so they would run at 12v constantly (Loud)
I don't reccommend LED fans, mine were LED and the change in voltage from changing the speed makes them go dim, not a massive issue but you might not want that
An On/Off Switch
A SPDT switch (3 pins underneath on/on)
Some bits of wire
Soldering iron and solder
Electrical tape or Heat shrink
A computer or computer powersupply to give the fans power
Maybe a screwdriver to open your PC case
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