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Thread: HOWTO: Power a USB Hub for the G4

  1. #11
    Variable Bitrate JasonMK's Avatar
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    Thanks, very helpful even for someone like me

  2. #12
    bir
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    pim,

    The power supply is only rated to 3A so any 5V Relay with >3A should work. The one god of cpu referenced is really just a great price for a nice small relay, but any relay will work. My Deutsch is beyond rusty but I believe this one will work (part no: 504197 - 62 ):

    http://www1.conrad.de/scripts/wgate/...1&cachedetail=

    Someone else will have to confirm, but I believe it is a standard 5VDC 5A normally off relay which this project calls for...

    Hope that helps.

  3. #13
    pim
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    Thanks, bir.

    You can't deeplink into the Conrad site, good you mentioned the part no.

    Pim

  4. #14
    bir
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    I figured I couldn't direct link, but was too lazy to double check

    Glad you could find the part.

  5. #15
    pim
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    What confuses me is that the USB hub that is referenced in god_of_cpu's article looks to me like a bus powered one. It says so on the packaging and I don't see an external input. Shouldn't the output of the Carnetix be connected to the external power input of the hub?

    Also, if the hub is big enough, couldn't the relay and the power regulator just be built in to the hub case? That might make access to all the power leads easier.

    Pim

  6. #16
    pim
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    Just contemplating; that might be a nice product in the mp3car store; a 12v relay powered USB hub...

    Pim

  7. #17
    pim
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    Quote Originally Posted by IandI View Post
    Is there a reason why you can't eliminate the relay and wire the GRN/BLK wire of the CNX-P5V directly to the USB power from the G4?
    Started reading the Carnetix manual and the same question popped into my mind.

    Too bad this question is left unanswered.

    Also, wouldn't it be a good idea to fuse the 5v output prior to the device or hub?
    Now this question is answered in the manual. Yes, you should use a fuse.

    Pim

  8. #18
    pim
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    Quote Originally Posted by pim View Post
    What confuses me is that the USB hub that is referenced in god_of_cpu's article looks to me like a bus powered one. It says so on the packaging and I don't see an external input.
    Confusion over. I ordered a small USB hub from CarTFT and got the exact same model as the one shown in the mp3car store. It does indeed have a power supply input, but no power supply.

    Pim

  9. #19
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    Quote Originally Posted by pim View Post
    Started reading the Carnetix manual and the same question popped into my mind.

    Too bad this question is left unanswered.
    I am 99% sure you don't need the relay, but if you want to isolate it from the G4 for some reason then use the relay. I don't think I saw that version of the manual before. It has a bit more details than the one I downloaded previously. I will try it tomorrow and let you know, as I didn't have the need to install it yet.

  10. #20
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    I won't be using this for a G4 but I think I understand what to do. Could someone confirm for me that I am understanding this correctly?

    Name:  Cnxp5v diagram.jpg
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    Thanks!

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