Page 1 of 2 12 LastLast
Results 1 to 10 of 19

Thread: Powered USB Hub

  1. #1
    Newbie
    Join Date
    Mar 2005
    Posts
    7

    Question Powered USB Hub

    I have a Belkin USB hub that can work in external powermode or bus power mode. Until now i have been fine using it in bus powered mode. I would like to use my extrnal usb 2.5" HD with it which can be powered by USB. There's not enough power to run it in bus powered mode on the hub . I would like to tap the 5v rail of my M1-atx to power this device but the problem is the PS that came with hub is 7v there is no marking on the hub that says anything about power requirements. Do you think I would be safe using the 5v rail of the my PSU?

    Thanks

  2. #2
    Variable Bitrate warnockm's Avatar
    Join Date
    Jun 2004
    Location
    Virginia
    Posts
    433
    use your computers 12 and 5v power supplies. I just wired this up last night. I was tired of using electrical tape and screw on wire connectors. it wasn't pretty and wasn't safe so I took a hard drive power splitter and cut off the one Molex connector. I ran wires from the 12v, 5v and two grounds to a connector peice. I'm not sure what it's called but it has 8 connections on one side and 8 on the other side and lets you screw wires into place connecting from one side ot the other. Anyway, i connected the 4 connections to this wire connector (bridging the wires so that each peice, 12, 5, gnd, gnd) occupied two spaces. Then on the other side i connected some devices. my fans and lcd screen run on 12 volts so they got that, and the USB hub gets 5v so i connected a wire and ran it outside of the box to the USB hub. i purchased a connector from radio shack to connect into the hub. take your hub in and see which fits.

    sorry if the description isn't great. i hope to have pictures soon.
    Progress - VIA EPIA SP8000 | 120 Opus Power Supply & Case | 1GB Ram | 120GB 2.5" Hard Drive | Bluetooth 2.0 | GPRS/3G | Wifi | Road Runner/LSX 2.0 (waiting for a day skin for 3.0) | iGuidance 4.0 | Lilliput 7"

  3. #3
    Constant Bitrate DJKhan85's Avatar
    Join Date
    May 2004
    Location
    Boston, Mass
    Posts
    173
    I remeber reading somewhere that if you use the 12 volt line(yellow) and the 5v ground(the adjacent black wire to the red wire) You will either get 7.5 volts or 7 volts. I will try this out when I go home with my multimeter.
    Computer:
    COMPLETE SYSTEM OVERHAUL!!!!!!
    STAY TUNED IN THE UPCOMING WEEKS!

  4. #4
    Variable Bitrate warnockm's Avatar
    Join Date
    Jun 2004
    Location
    Virginia
    Posts
    433
    Quote Originally Posted by DJKhan85
    I remeber reading somewhere that if you use the 12 volt line(yellow) and the 5v ground(the adjacent black wire to the red wire) You will either get 7.5 volts or 7 volts. I will try this out when I go home with my multimeter.
    I found that both grounds were the same. maybe you were connecting +5 to +12? that would give u difference of 7 volts.
    Progress - VIA EPIA SP8000 | 120 Opus Power Supply & Case | 1GB Ram | 120GB 2.5" Hard Drive | Bluetooth 2.0 | GPRS/3G | Wifi | Road Runner/LSX 2.0 (waiting for a day skin for 3.0) | iGuidance 4.0 | Lilliput 7"

  5. #5
    Variable Bitrate numbers's Avatar
    Join Date
    May 2005
    Posts
    370
    It's true that all black ground wires are the same. You have to use 12v and 5v, but I can't honestly recommend doing this for anything other than a tiny fan or two. Power supplies just weren't made to use the +5v rail as a negative rail.

  6. #6
    Variable Bitrate warnockm's Avatar
    Join Date
    Jun 2004
    Location
    Virginia
    Posts
    433
    Quote Originally Posted by numbers
    It's true that all black ground wires are the same. You have to use 12v and 5v, but I can't honestly recommend doing this for anything other than a tiny fan or two. Power supplies just weren't made to use the +5v rail as a negative rail.
    voltage is all relative. if you aren't comparing voltages to ground, the device and PS will never know the difference. I haven't had a reason to use 7 volts versus 5 or 12, so i'm not doing it.
    Progress - VIA EPIA SP8000 | 120 Opus Power Supply & Case | 1GB Ram | 120GB 2.5" Hard Drive | Bluetooth 2.0 | GPRS/3G | Wifi | Road Runner/LSX 2.0 (waiting for a day skin for 3.0) | iGuidance 4.0 | Lilliput 7"

  7. #7
    Newbie
    Join Date
    Aug 2005
    Posts
    7
    To run a USB hub you'll be needing 12 Volts, well mine did atleast.

    As for getting 7 Volts, from what I remember it was getting the 12 and 5v lines and regulating them :/ I can't really remember since its been that damn long since I looked at it and never having needed to do it

  8. #8
    Variable Bitrate
    Join Date
    May 2005
    Location
    Woodstock, GA
    Posts
    342
    Quote Originally Posted by ninjageek
    To run a USB hub you'll be needing 12 Volts, well mine did atleast.
    Mine takes 5v
    Is this where the witty comment goes?
    97 Black pearl Mazda Miata MX-5 Carpc V2? maybee..

  9. #9
    Para Laura thanatos106's Avatar
    Join Date
    Nov 2004
    Location
    Miami Beach,FL U.S.A
    Posts
    3,497
    mine is 5v too.
    RexBruMet Skin for FrodoPlayer

    Nissan Aux-in MOD


    Quote Originally Posted by bgoodman
    We're an international forum, post in whatever langauge you like.

  10. #10
    Low Bitrate
    Join Date
    Jul 2005
    Location
    Jakarta
    Posts
    59
    Dangerous to produce 7 volt from 12 - 5 volt.
    0 V = Ground = signal common = connected to case sometime.

Page 1 of 2 12 LastLast

Similar Threads

  1. Replies: 197
    Last Post: 06-15-2006, 08:47 PM
  2. recommend a powered USB 2.0 hub
    By schapman43 in forum General Hardware Discussion
    Replies: 4
    Last Post: 07-16-2005, 10:40 PM
  3. ? about powered USB hubs
    By schapman43 in forum General Hardware Discussion
    Replies: 1
    Last Post: 07-16-2005, 03:38 PM
  4. Externally Powered USB Hubs and Car Power
    By chewiee in forum General Hardware Discussion
    Replies: 3
    Last Post: 03-20-2005, 10:55 AM
  5. Best USB Hub
    By nsmoller in forum Input Devices
    Replies: 29
    Last Post: 02-08-2005, 03:35 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •