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Thread: How to power 5V usb hub from 12v

  1. #11
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    Quote Originally Posted by spaceman
    Thanks

    Im not all that electronically minded, looks a bit confusing with all the different diagrams. Anyway i ordered some samples of it, so ill see how i get on when i receive them.

    Do these maintain a constant output, even with a varied input ( 12-14v)
    It really isn't that hard. WHen you get them, if you need help, just let us know.

    Yes, they will maintain the voltage even with a varied input, as long as it is above the threshold voltage. Basically, the input voltage has to be a certain amount above the output voltage. Usually it is about half a volt to a volt. You should have no problems getting clean, steady 5 volts in the car, since if the battery/alternator get anywhere near 5 volts, it wouldn't be working.

    Michael
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

  2. #12
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    Thanks for all your help. I prob will have to get back to you when i receive them.

  3. #13
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    Or you could use a http://focus.ti.com/docs/prod/folders/print/pt6653.html to get upto 5a at 5v
    Old setup
    Epia M10k, Cubid 2699R case, 512MB, 40GB 3.5" drive
    New setup
    Optiplex 260SX (2.8GHz P4, 512MB, 30GB, DVD)
    Xenarc 700IDT, USB hub, 802.11g, bluetooth, P2140, P5V

  4. #14
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    Carnetix have just released the 1290 it supports 12v and a seperate 5v O/P
    http://www.carnetix.com/CNX_1290.htm

  5. #15
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    Quote Originally Posted by klokman
    Carnetix have just released the 1290 it supports 12v and a seperate 5v O/P
    http://www.carnetix.com/CNX_1290.htm
    The 1280 has always had a seperate 5v output, and it can also add another one with the new module due for release soon...

    But, spaceman already has a M1-ATX so doesn't need a complete PSU-shutdown controller etc...
    Old setup
    Epia M10k, Cubid 2699R case, 512MB, 40GB 3.5" drive
    New setup
    Optiplex 260SX (2.8GHz P4, 512MB, 30GB, DVD)
    Xenarc 700IDT, USB hub, 802.11g, bluetooth, P2140, P5V

  6. #16
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    You've obviously being doing this for longer than me! I stand corrected, and also have more options for the same problem

  7. #17
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    i have the same issue with my dvd drive maxing out my opus.
    But im so electonically challenged that i have no idea how or what these regulators are and work.
    If i were to buy a new opus 150 watt psu would this be easy to wire up and would this even be possible?

    sorry for the threa jacking.

  8. #18
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    For those who are electronically challenged or just don't want to build their own.

    http://store.cd4power.com/cgi-bin/cd...d/Catalog/1051

  9. #19
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    Well the TI one I linked to can be ordered as a free sample (multiple times ) and only needs a couple of capacitors adding to it...
    Old setup
    Epia M10k, Cubid 2699R case, 512MB, 40GB 3.5" drive
    New setup
    Optiplex 260SX (2.8GHz P4, 512MB, 30GB, DVD)
    Xenarc 700IDT, USB hub, 802.11g, bluetooth, P2140, P5V

  10. #20
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    Today i received samples of the LM338T regulator.
    The data sheet can be found here http://www.national.com/ds/LM/LM138.pdf

    Im not all that great at elctronics, so i was just wondering if anyone can help to set this up. Ive worked out that i need 2 resistors and maybe a capacitor.

    But i really dont know what value resistors to get and exactly how to set it up. Also, do i need a heatsink?

    Any help would be hugely appreciated

    Thanks

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