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Thread: Externally Powered USB Hubs and Car Power

  1. #1
    Constant Bitrate chewiee's Avatar
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    Apr 2004
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    Externally Powered USB Hubs and Car Power

    OK,

    Carnetix is cool, I get enough juice to run the following:
    CarPC
    Wireless Lan
    External HD where all my songs live (USB and hibernation issues never resolved)
    BU303 GPS Dongle
    Wireless Keyboard

    But if I want to add my bluetooth adapter etc I can't seem to get enough power to my USB HD.

    I found a car 12v multi adaptor for the car called a "Sunpower 14.4 Watt Car Power Adaptor"

    It provides the following voltages: 1.5, 3, 4.5, 6, 7.5, 9 and 12 and has an output current of 1200ma at full load.

    Can I use this to power my external hub. I am a little curious as USB is 5v and I have a hub upstairs that outputs 7.5 in the house. Could I run it in the car, without causing any issues? I would of thought I would need exactly 5v.

    Chewiee

    VW Mk2 Golf GTI 16V:
    Kenwood KDC-W6527 HU
    Silver Travla C134, Slot Loading DVD/CDRW,
    256MB, VIA Epia MII 12000, Carnetix 60W, Xenarc VGA/Composite TS and a GPS Mouse

  2. #2
    Raw Wave Confused's Avatar
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    You could run that hub from the 7.5V output of that - providing it doesn't require more than 1.2 Amps

    My USB hub requires 6V, and that's been running OK on 5V, but i wouldn't chance the 7.5V hub on 5v!


    Garry
    Co-Developer of A.I.M.E.E
    www.aimee.cc

  3. #3
    Maximum Bitrate kiltjim's Avatar
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    I was looking for a simple solution for my hub as well. But my hub requires 2.2 amps at 5 volts. I'm sure I may be able to get away with 6 volts, but if I get close to the maximum current draw, I'm afraid of blowing out the converter.
    2000 Subaru OBS

    Dell P3 @ 900 Mhz
    7" Lilliput TS w/DigitalWW in-dash mount
    80GB External HD

    I am Zero Bitrate....

  4. #4
    Constant Bitrate chewiee's Avatar
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    Apr 2004
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    Car Multi Adaptor from Maplins

    Ahh well tried this at the weekend and it didn't work

    I connected it to the ground and live on the block on my amp, and it lit up showing power (no volt meter to hand), and connected it to my USB hub, it didn't give any extra juice to my devices

    I disconnected it from the amp power, and noticed that it was still receiving power from the USB hub (must be from the PC somehow).

    I am going to try a different hub, and see if I get any more luck before it gets put in the big box with bits that I 'plan to use in the future'!

    Will let you know how I get on.

    Chewiee

    VW Mk2 Golf GTI 16V:
    Kenwood KDC-W6527 HU
    Silver Travla C134, Slot Loading DVD/CDRW,
    256MB, VIA Epia MII 12000, Carnetix 60W, Xenarc VGA/Composite TS and a GPS Mouse

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