Is it possible to use a usb cord with a 12v case fan?


  1. Advice Pro
       New #1

    Is it possible to use a usb cord with a 12v case fan?


    I want to connect a 12v 3 / 4 pin case fan with a usb cord. I know that it's possible with lower voltage.

    Here's an adapter for 4-pin to usb:

    amazon.com/StarTech-Motherboard-4-Pin-Header-USBMBADAPT/dp/B000IV6S9S/ref=sr_1_23?s=electronics&ie=UTF8&qid=1361905489&sr=1-2
    Attached Thumbnails Attached Thumbnails Is it possible to use a usb cord with a 12v case fan?-710mnra9rsl._sl1500_.jpg  
    Last edited by Advice Pro; 26 Feb 2013 at 14:09.
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  3. hoganth
    Posts : 123
    WinXP / Win 7 / Win 8.1 64bit Dual Boot
       New #2

    You only get 5 volts from USB Header. What plug do you have on the fan?
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  4. Lady Fitzgerald
    Posts : 9,600
    Win 7 Ultimate 64 bit
       New #3

    5v is iffy for running fans. Many, if not most, need at least 7v to run.
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  6. ICIT2LOL
    Posts : 21,004
    Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10
       New #4

    Well even if it did run on 5v the question is then what sort of current are you going to be pulling with any particular fan? But as Lady says fairly slim chance of it running on 5v and even 7v.
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