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Thread: Powering multiple USB devices

  1. #1
    FLAC PhilG's Avatar
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    Powering multiple USB devices

    I have finally collected most of the pieces to complete my PC. I am asking for help to configure power supplies.

    Here is the harware list:

    HP 6710b Laptop (4 built in USB ports) 4.75a @ 19v

    Current USB devices 5v power

    C. Labs X-fi sound card 400 mA
    Griffin Powermate 100mA
    Lilliput Touchscreen Interface 50mA
    Mobile cellular Network Card (I have a PMCIA card
    now but will likely update to USB soon) 500mA
    Keyboard/Mouse Dongle 100mA
    Web Cam 100mA
    Global Sat BU-353 receiver 100mA
    Ipod Classic 500mA
    Panasonic slot load DVD w/USB interface 2000mA
    Will add on OBDII scanner (not sure of power needed) ??


    12v power

    MJS-SCC1 sirius Interface 1 amp
    Lilliput Monitor 10 watts

    For available power supplies, I have:

    Carnetix CNX1900 19v @ 6.32amps (laptop is looked after with this)

    secondary output 12v or 5v @ 3 amps

    opt. CNX-P5v 5v @ 15 watts (this was built into the used PS which i did not expect)

    a 2nd CNX-P5v 5v @ 15watts ( I ordered this one not expecting the other one.
    It can be used as a stand alone component though)


    I bought the USB-MH20-G 4 port USB hub with my store order because it was only $3. I can add a 5 volt supply to it but it appears I have 12 USB devices minus the 4 ports on the laptop therefore needing 8 additional ports. I should probably buy a stand alone powered 6 or 8 port hub so any suggestions there would be appreciated.

    Soooo, how should I configure my power supplies to be the most efficient?
    Which devices will benefit most from being plugged directly into the laptop versus into the hub?

    Thanks in advance for any advice/ points of view.
    My 2007 Ford F350 Work Log located HERE

  2. #2
    Variable Bitrate sargeants's Avatar
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    Warning about the power supply and the HP(also Dell) setup.... you will not have a properly functioning machine if you play to just run the 19volts from the Carnetix to a hacked up adapter plug... I guarantee it! (check my worklog)
    you will NEED to have an auto/air adapter inline unless you're able to strip the ID chip from the adapter to give the signal over that centre pin.

    As for power your DVD drive will definitely need to have a solid 5v power from either the system or a powered hub. So far I'm running my GPS and OBDII off a 4port hub(non powered at the moment) without issues.
    03 Hyundai Elantra GT {Worklog}
    HP TC4400; 250GB SATA, WiFi, BT, 12.1" touch
    RideRunner; w/ mobilephone.net, OBDMPG, mediaart, RRMedia, DFXVoice and more...
    cmdRR tall skin creator

    86 Pontiac Fiero SE 2m6
    possible carpc install

  3. #3
    FLAC PhilG's Avatar
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    Thanks for the heads up on this!
    I haven't researched the wiring of the PS in detail yet but I thought I could open up the laptop and wire the PS to the termininals on the power button. Is this the case? Are you suggesting that this won't work or just that I can't plug into the original input jack?

    Do you or anyone else have any advice on a powered hub with 8 ports, maybe that can be sourced from a big box store or something?
    Will all USB ports built into the laptop & on an external hub be treated by the OS equally or do the built in USB ports get a faster connection or more bandwidth? (ie: should the soundcard be connected directly to the laptop to ensure SQ)?

    I'm just trying to do it right the first time, thanks in advance!
    My 2007 Ford F350 Work Log located HERE

  4. #4
    Variable Bitrate sargeants's Avatar
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    First thought - Well if you're wanting to take the effort and tear that machine all apart just to solder to the board, then by all means... I just don't see how that will bypass the ID chip unless you're gonna find a spot to hook the power up to after the ID check. I just know that it's not too spacious around that jack on the inside. (computer tech that deals with 6400/6910s every other day... essentially the same as 6710). Unfortunately I don't have any spare boards to test that idea on.

    Second thought - after re-reading your post I'm coming up with this instead, but didn't want to delete what I already wrote. I don't believe hooking the power supply up to the switch will work. Since the switch is just a monetary signal that's being passed from the strip board to the systemboard, there's no constant flow of power. You'll still need to tap into the power switch to put either a hard-wire switch into your dash, connect it up to the carnetix or both. The switch and power source are separate areas to deal with.

    Hope I'm not scaring you, just trying to help out in getting it right the first time.

    Have you checked out TigerDirect?
    http://www.tigerdirect.ca/applicatio...usb%20hub&mnf=

    You may get better results having the more commonly used components directly connected. There may be standby/restarting issues with some hubs.
    03 Hyundai Elantra GT {Worklog}
    HP TC4400; 250GB SATA, WiFi, BT, 12.1" touch
    RideRunner; w/ mobilephone.net, OBDMPG, mediaart, RRMedia, DFXVoice and more...
    cmdRR tall skin creator

    86 Pontiac Fiero SE 2m6
    possible carpc install

  5. #5
    FLAC PhilG's Avatar
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    I read your log and now I understand the issue. This laptop was driven over (don't ask) when it was only 3 months old. The screen and lid cracked, the base survived, and it hasn't been used since. Heck it's still under the 3 year warranty. So I want to remove the lid/screen and just install the base.
    So I don't mind opening this thing up but now I understand that even opening it up and accessing the power button may not help. I'm really glad you chimed in on this before I got to hacking it!
    So, if I understand you correctly, the best solution is:
    >wire the P1900 to the vehicle
    > buy an auto adapter and cut the plug off it and wire it to the P1900, configured for 18V output (the auto adapter I found claims 12-24v input acceptable)
    >plug the auto adapter into the laptop.

    By doing the above, is there stilll a way that I can take advantage of the P1900 on-off capabilities when the vehicle is atarted/stopped? Are there other wires I can hook up from it to accomplish this?

    On the USB front, I picked up 2 - 4 port hubs from the source being cleared out for $20 each 1/2 price (part #2616525). They each came with a 2.5amp P/S so that means I could be able to use the two 5v - 3amp Carnetix outputs to power these, right? Should I daisy chain them or use up 2 of the ports on the laptop? Which way will provide better performance?

    Thanks again for your help. I have figured my way through the entire process with out asking alot of questions, just doing hours of reading here. But now I really want to maximize USB performance and try to get the powering of everything right the first time!

    I will post a full work log with pictures to give back to mp3car as soon as I get started on the install.
    My 2007 Ford F350 Work Log located HERE

  6. #6
    Variable Bitrate sargeants's Avatar
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    Don't worry.... I've seen my fair share of damaged laptops.

    Thats exactly how I've got mine hooked up
    - Cut the wire on the adapter that would normally be plugged into the lighter socket and run that to the primary output and ground of the p1900.
    - configure the p1900 how you want it (I've got mine set that it will keep a trickle charge and send a turn off signal within 6 secs)
    - there's a hookup (black and green wires) in the P1900 that you need to connect up to the power switch ... which IIRC is attached to the strip cover across the top; should be able to solder the wires to the switch... if not then you'll have to trace the switch to the cable/wires which goes to the board.

    I would run the 2 4ports off their own usb port on the laptop; less chance of having an issue.

    If you're near the GTA and have more questions I'd be willing to help out.

    One thing I found out with my setup is that when I have the laptop battery in it will squeal a bit when powered on - may be the fact that this systemboard has been repaired multiple times.... initially had a brownie jammed into the docking port beat that with your cracked screen!! :P With that though, you can easily remove the screen and only have the strip cover to modify to make it completely flat. I can't recall if the external output will consistently be used when you have a monitor plugged in or not. With the TC4200/4400 you need to have a magnet to trip the one sensor. I'd check inside the screen to see if there are small magnets stuck to the front bezel, then line that up with base of the unit and see how that helps.

    Now I'm rambling after the beers
    03 Hyundai Elantra GT {Worklog}
    HP TC4400; 250GB SATA, WiFi, BT, 12.1" touch
    RideRunner; w/ mobilephone.net, OBDMPG, mediaart, RRMedia, DFXVoice and more...
    cmdRR tall skin creator

    86 Pontiac Fiero SE 2m6
    possible carpc install

  7. #7
    FLAC PhilG's Avatar
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    "initially had a brownie jammed into the docking port beat that with your cracked screen"

    LMAO, that's too funny. I'm just up in Peterborough so I may take you up on your offer for help if I get into a mess. But I think I can get through it.

    I will locate an auto adapter then start to wire it up and see where it goes from there. I'm travelling this week but will order the adapter so hopefully by the time I get home, it's there.
    Do you know of a Canadian source where I can order online? I'd try to pick one up in the big box stores but I doubt they would stock something like this.
    As far as the VGA out, there is a lid button that I can tape down that should work. I had the laptop all loaded with toys and working then it crashed for no apparent reason and I lost the full setup. I have reimaged from the HP recovery but have not had time to shrink XP yet or get the hareware working again. I had the GPS, Sirius radio, and Xfi all working but could not get the Powermate to work. This time before I install Centrafuse, I am going to try to get it working first.
    Anyway, while I had it set up and running in the house for a month on and off, the Lilliput screen seemed to come on each time I booted so I don't think I have an issue there.
    Thanks again.
    Phil
    My 2007 Ford F350 Work Log located HERE

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