Overclock.net › Forums › Overclock.net Forum › FAQs › How to: 5 volt mod my fans?
New Posts  All Forums:Forum Nav:

How to: 5 volt mod my fans?

post #1 of 3
Thread Starter 
Is the 7 volt mod better, but not quiet enough? Do you not want to risk your 5 volt rail by using a 7 volt mod? Do you want a method of variable speed control? Well then I have the mod for you!

If you put your fan on the 5 volt rail with out a switch to the 12 volt rail, and you have a high speed fan, chances are that it will not spin. This is because the fan's motor is not recieving enough voltage to start spinning. When all electric motors start to spin they need enough voltage to meet thier minimum start up voltage, however, once the fan stats to spin the ammount of voltage required to keep it spinning is less than was required to make it spin from a stop. This is similar to boiling a pot of water, it takes a lot of energy to boil water, but it does not take a lot of energy to keep it at a boil.

My mod allows you to start the fan on the 12 volt rail and then switch it to the 5 volt rail. It can be very useful. For example, you run the fan on 12 volts when you are running benchmarks and games and run them at 5 volts while you sleep.

The most important part of this mod is the switch. It must have 2 positions, one that connects the first and second attachment points and one that attachesthe second and third points. I like to use the 120 volt / 240 volt switch out of power supplies. See picture one for a visual.

I recomend putting this mod on a 4 pin male molex to 2 4 pin female molex splitter. This way you don't have to worry about trashing your psu, and you can still use the other side of the splitter. If you need an image, see pic 2.

Now for the modification.

1. Pick which side of the splitter you are going to use.

2. Cut the red and yellow wires at thier midpoints and strip 1/2 inch of insulation off the male molex end of the wires.

3. Strip 1/2 inch of insulation off the yellow wire on the female molex side.

4. Cut the black wire next to the red wire at both ends flush with the molex connecter on both ends.

5. Refer to diagram 3 at this point.

6. Cut the red wire flush with the female molex connecter only.

7. Solder the red and yellow wires coming from the male connecter to attachment points 1 and 3 on the switch.

8. Solder the yellow wire from the female molex to attachment point 2 on the switch.

9. Make sure that the black wire next to the yellow wire is still intact.

10.Refer to diagram 4.

11.Insulate all ends of all wires and the switch. Hot glue works well, because it is an insulator, it helps hold your solder joints together, and it is easy to apply.

!2. If you have any questions pm me.

-dazed and confused
LL
LL
LL
LL
LL
My System
(13 items)
 
  
CPUMotherboardOSMonitor
amd 4000+ Asus A8N32-SLI deluxe Windows XP Tatung 15" 
KeyboardPowerCaseMouse
older than yours 600 watt ocz thermaltake tsunami memorex 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardOSMonitor
amd 4000+ Asus A8N32-SLI deluxe Windows XP Tatung 15" 
KeyboardPowerCaseMouse
older than yours 600 watt ocz thermaltake tsunami memorex 
  hide details  
Reply
post #2 of 3
Thread Starter 
no feedback?
My System
(13 items)
 
  
CPUMotherboardOSMonitor
amd 4000+ Asus A8N32-SLI deluxe Windows XP Tatung 15" 
KeyboardPowerCaseMouse
older than yours 600 watt ocz thermaltake tsunami memorex 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardOSMonitor
amd 4000+ Asus A8N32-SLI deluxe Windows XP Tatung 15" 
KeyboardPowerCaseMouse
older than yours 600 watt ocz thermaltake tsunami memorex 
  hide details  
Reply
post #3 of 3
Good job......but you made it WAY more complicated than it ad to be.....lol.....
The Overmind
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 Gigabyte GA-EX58-UD5 EVGA GTX 280 SLI G.Skill 6GB DDR3 1600MHz 
Hard DriveOptical DriveOSMonitor
Maxtor 500GB SATA, Seagate 1TB, 60GB OCZ Vertex 2 Generic Asus Multiformat Windows 7 RC1 Dell 3007WFP-HC 
KeyboardPowerCaseMouse
Saitek Eclipse Silverstone Decathalon 1000 Watt Antec 900 Microsoft Sidewinder 
Mouse Pad
Spongebob Squarepants Bitch! 
  hide details  
Reply
The Overmind
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 Gigabyte GA-EX58-UD5 EVGA GTX 280 SLI G.Skill 6GB DDR3 1600MHz 
Hard DriveOptical DriveOSMonitor
Maxtor 500GB SATA, Seagate 1TB, 60GB OCZ Vertex 2 Generic Asus Multiformat Windows 7 RC1 Dell 3007WFP-HC 
KeyboardPowerCaseMouse
Saitek Eclipse Silverstone Decathalon 1000 Watt Antec 900 Microsoft Sidewinder 
Mouse Pad
Spongebob Squarepants Bitch! 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: FAQs
Overclock.net › Forums › Overclock.net Forum › FAQs › How to: 5 volt mod my fans?