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11243 Views 3 Replies Latest reply: Jan 24, 2013 12:42 AM by Anderskerki RSS
Currently Being Moderated

Jan 21, 2013 5:50 PM

Computer Fan Help

I have a DC12V 0.24A brushless fan and a 4.75V 0.2A Cell phone charger wall plug. can I use the wall charger to power the fan and how would I increase the voltage going to the fan?

  • M.Emara Novice 17 posts since
    Sep 14, 2011
    Currently Being Moderated
    Jan 22, 2013 4:23 AM (in response to Anderskerki)
    Computer Fan Help

    There are many solutions for such application, each solution will depend on the requirements of your system:


    You can use DC-DC Converter Charge Pump. Charge pump step up voltage is able to take (in) lower voltage to supply (out)higher voltage. As an example this charge pump (EXR Mfr Part No: SP6661EU-L) is able to double the supply voltage, if you apply on it 5(V), it will be able to generate 10(V).


    ► Buy a cheap PC Power Supply to power the fan. Power supplies convert AC input to lower DC voltages. The typical voltages supplied are: 3.3(V), 5(V), and 12(V). The 3.3- and 5-volts are typically used by digital circuits, while the 12-volt is used to run motors in disk drives and fans. There are many wires inside the PC power supply case, the yellow wire is 12(V), Red 5(V), Orange 3.3(V), Black Ground, White -5(V). For your application you can power the DC fan by the yellow and the black wires from the PC power supply.


    inside of a computer power supply


    You can use a Solar Panel (photovoltaic). The solar panel has two terminals - positive and ground -



    You can use batteries, you can charge capacitors then use them to power your circuit. There are many solutions each one of them is depending on your intended use. 

  • Novice 8 posts since
    Sep 25, 2012
    Currently Being Moderated
    Jan 23, 2013 10:30 PM (in response to Anderskerki)
    Computer Fan Help

    No, you cannot use that supply to run that fan @ 12 volts…don’t forget watts law.


    The Fan = 12V X .24A = 2.88 watts


    Supply = 4.74V X .2A = .95 watts


    Forget about trying to raise the voltage on that supply, it probably won’t supply the power needed.


    Forget about buying a PC power supply to drive one little fan. LOL


    Forget about the solar cells and the battery…


    And the caps…lol…A bazillion UF cap would run that fan for about the time you can sneeze.


    Buy yourself a small regulated 12 Volt DC wall wart, and save yourself a great deal of time and trouble.

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