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Thread: Power USB devices

  1. #21
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    Did you even read my post or just the title?

    Quote Originally Posted by spdyscotty
    I need extra power for my USB harddrive and USB DVD player. I've read up on the topic and even made various posts. But, I just stumbled arcross the "CNX-P5V 15 Watt +5V Regulator". Not a bad price. I know I could make it myself, but this seems easier. 15watts is way more than enough. 3 watts would probably be sufficient. Is there a similar option that would be easier / cheaper? Any ideas? Am I being silly? Maybe I should build it?
    I was asking if this was a suitable alternative, or if I should stick with building it. This then sparked another question of mine which brought us to this point. I appreciate your advice, but not when you try to belittle me. Grow up or fond something else to make you feel important.

  2. #22
    FLAC
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    spdyscotty,

    Can you post a (close up) picture of the DC input connection on your PCMCIA USB hub? Also, can you post a picture of the DC->USB cable? This would help.

    What brand of USB adapter is it (any markings on the unit)? Did it not come with hookup instructions? Did it come with an AC/DC "wall wart"? Where does the AC/DC adapter plug in? Does the AC/DC adapter say "+5V" on it?
    MikeH

  3. #23
    Low Bitrate Bryan Pape's Avatar
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    Quote Originally Posted by MikeH
    Many USB hubs allow "non-bus power" which is essentially a barrel plug on the side of the hub that accepts an external +5V supply. There's a picture of a powered hub HERE (bottom of page). If you have power hungry USB devices (ie Audigy USB sound card) you can provide external power to the hub instead of loading down your PC's PSU.
    You gotta be careful with this. If you drive your Audigy from a different 5V source then your motherboard you're begging for ground problems. I just an OPUS today just so I could run everything from one line just to resolve this very problem.

    Bryan

  4. #24
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    Thank's to everyone for trying to clear this up for me. Regardless of what that port was for (no instructions whatsover on this ebay product, not even markings) I ened up buying an external powered hub as it would help my to reduce wires anyways. Final result, it works! I now have enough power to run my devices. That is if I use to 2.1Amp AC/DC adaptor. I may have to get a DC/DC still, but if I end up going with an inverter I may be set. Also, while at Frys Electronics today i notices all their PCMCIA "CardBus" USB cards have that DC jack on it.

    Bryan- would my above setup (laptop and hub both powered via inverter) pose a ground problem? I havent tried it in the car yet so I don't know the results.

    Scott

  5. #25
    FLAC
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    I have powered the Audigy 2NX from the secondary output of a P1280 and it worked perfectly with absolutely no noise.
    MikeH

  6. #26
    Variable Bitrate bambam's Avatar
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    Question for "fromplanetbob"

    I too have an Opus 150 (that works perfectly all the time!) but I am looking for more power for a usb hub and Audigy 2 NX. I was reading everything I could and came across your post.

    What 2nd power supply are you using and am I correct in stating that you connected the ACC line of the 2nd power supply to a 12V output of a molex connector (yellow line)?

    Thanks, you really peaked my interest!



    Quote Originally Posted by fromplanetbob View Post
    I could be wrong, but USB Powered Devices can only pull a max of 500 mA (or 1/2 amp).

    Personally, I'd run a 5v regulator with a relay (turn the relay on and off with the 12v power of the computer, so it turns the hubs on and off when you turn the computer on an off.)

    I have a second power supply to supply my USB devices. I hooked up the ACC line for that power supply to the 12v output of my OPUS 150 that powers my computer, that way it turns on when my computer is on.

  7. #27
    Variable Bitrate fromplanetbob's Avatar
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    http://store.mp3car.com/ProductDetai...Code=PWR%2D020

    I no longer have a car computer though. Well, I do, it's sitting in my car still installed with a crashed hard drive. But I'm using a Nuvi now for everything.

  8. #28
    Variable Bitrate bambam's Avatar
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    Thank you for taking the time to respond...that is exactly what I am looking for!


    Quote Originally Posted by fromplanetbob View Post
    http://store.mp3car.com/ProductDetai...Code=PWR%2D020

    I no longer have a car computer though. Well, I do, it's sitting in my car still installed with a crashed hard drive. But I'm using a Nuvi now for everything.

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