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Recommended Book
Maximum PC Guide to Extreme PC Mods (Maximum PC Guide To...)
By Jon Phillips
Que
Price: $29.99

Home » Cooling
How to Create a Three-Speed Fan Control Without Spending a Dime
Author: Gabriel Torres
Type: Tutorials Last Updated: November 15, 2007
Page: 3 of 3
Connecting the Wires to the Power Supply

Now you will connect the wires from the fan to any unused peripheral power plug from the power supply. The way you will connect the fan wires to the power supply will depend on the speed you want to configure your fan with. You have three options: low speed (+5 V), medium speed (+7 V) or full speed (+12 V). You may be asking yourself how can we get +7 V since the power supply doesn’t provide such voltage. Here is the trick. If you connect one wire to +12 V and the other wire to +5 V you will have +7 V (12 V – 5 V = 7 V). It works like a charm.

So for low speed you will connect the black wire from the fan to the power supply black wire and the red (or yellow) wire from the fan to the red wire from the power supply. As mentioned this will provide +5 V to the fan. We show how this is done on Figure 10.

How To Reduce Fan Speed
click to enlarge
Figure 10: Installation for low speed.

For medium speed you will connect the black wire from the fan to the red wire from the power supply, and the red (or yellow) wire from the fan to the yellow wire from the power supply. As mentioned this will provide +7 V to the fan.

How To Reduce Fan Speed
click to enlarge
Figure 11: Installation for medium speed.

And for full speed you have two options, one is to install the fan wires back to the fan connector or to connect the black wire from the fan to the black wire from the power supply and the red (or yellow) wire from the fan to the yellow wire from the power supply.

How To Reduce Fan Speed
click to enlarge
Figure 12: Installation for full speed.

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