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Thread: Case fan volt mod, 5v or 7v

  1. #1
    Hello, I havn't visited the boards since late in '05, been quite busy.
    Anyway, I want to know if anybody can help me mod a DC San Ace 120mm 12v fan to run on 7v or 5v.
    I have in my posession 4 of these fans with great blowing potential. Only problem is that they sound like a jet engine.

    The fan

    DC San Ace Brushless made by Sanyo Denki

    120mm x 38mm
    Blows 102.5 CFM at 2600 RPM
    Loud at 39 DB

    It runs on the 3 pin. I have searched and found lots of tutorials on molex connected, but not for the 3 pin.

    Somebody has to know how to do this.

    Thanks.
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  2. Software & Hardware   -   #2
    Virtualbody1234's Avatar Forum Star BT Rep: +2
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    On your fan there are 3 wires. Leave the yellow where it is (speed indicator).

    Connect the black and red as per these instructions below.

    http://www.cpemma.co.uk/7volt.html

  3. Software & Hardware   -   #3
    This is again for the fans with a molex connector.
    Is cut and splice the only option for the 3 pin connectors?
    Q6600 @ 3.42Ghz | Gigabyte EP35-DS3R | EVGA 8800GT 721/1802/2006 w/ Accelero S1 | 4gb Crucial DDR2 @ 760mhz | 750gb Hitachi 7k1000 | Corsair 520HX | 2 x Samsung SyncMaster T240 24" | Windows 7 Ultimate

  4. Software & Hardware   -   #4
    Virtualbody1234's Avatar Forum Star BT Rep: +2
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    All you really have to do is cut the black wire and connect it to a +5Volt source.
    The molex connector is just an easy access to +5V.

  5. Software & Hardware   -   #5
    clocker's Avatar Shovel Ready
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    Since you can't plug that fan into a motherboard header anyway (too much current draw), you can either just switch it to a Molex or get a Molex>fan header adaptor.
    Before you finalize the wiring though I'd just temporarily jury-rig it and make sure the fan will start from 7v- lots of fans won't.

    Your easiest option in either case would be to plug it into a fan controller.
    Sunbeam makes the best (and, oddly enough, one of the cheapest) I've ever used.
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  6. Software & Hardware   -   #6
    Alright clocker, thanks for the advice. Good to see you are still around these forums. Same to you VB1234
    I think a fan controller is going to be my best option. Then I can start them at full power and once they are spinning, then decrease voltage.
    Q6600 @ 3.42Ghz | Gigabyte EP35-DS3R | EVGA 8800GT 721/1802/2006 w/ Accelero S1 | 4gb Crucial DDR2 @ 760mhz | 750gb Hitachi 7k1000 | Corsair 520HX | 2 x Samsung SyncMaster T240 24" | Windows 7 Ultimate

  7. Software & Hardware   -   #7
    Well I found a couple 3 pin -> 4 pin adapters so I tried the 7v mod. The fans start up with ease and are actually quite quiet while still moving a fair amount of air. I am very impressed.
    The mod also took about 3 minutes to do and required no soldering or anything. Very easy, and free
    Q6600 @ 3.42Ghz | Gigabyte EP35-DS3R | EVGA 8800GT 721/1802/2006 w/ Accelero S1 | 4gb Crucial DDR2 @ 760mhz | 750gb Hitachi 7k1000 | Corsair 520HX | 2 x Samsung SyncMaster T240 24" | Windows 7 Ultimate

  8. Software & Hardware   -   #8
    Virtualbody1234's Avatar Forum Star BT Rep: +2
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  9. Software & Hardware   -   #9
    I also used a multimeter and the fans are indeed running at 7v. Unfortunately it is not digital so I do not have exact readings, but it's in the ballpark
    Q6600 @ 3.42Ghz | Gigabyte EP35-DS3R | EVGA 8800GT 721/1802/2006 w/ Accelero S1 | 4gb Crucial DDR2 @ 760mhz | 750gb Hitachi 7k1000 | Corsair 520HX | 2 x Samsung SyncMaster T240 24" | Windows 7 Ultimate

  10. Software & Hardware   -   #10
    Seedler's Avatar T__________________T
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    Can't you like, plug it into your AC current?
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