The Notebook Review forums were hosted by TechTarget, who shut down them down on January 31, 2022. This static read-only archive was pulled by NBR forum users between January 20 and January 31, 2022, in an effort to make sure that the valuable technical information that had been posted on the forums is preserved. For current discussions, many NBR forum users moved over to NotebookTalk.net after the shutdown.
Problems? See this thread at archive.org.

    maximum output voltage of your usb?

    Discussion in 'Hardware Components and Aftermarket Upgrades' started by c19932, Aug 7, 2009.

  1. c19932

    c19932 Notebook Guru

    Reputations:
    2
    Messages:
    57
    Likes Received:
    0
    Trophy Points:
    15
    how do you check the maximum output voltage of your usb?
     
    c19932, Aug 7, 2009
    #1
  2. Commander Wolf

    Commander Wolf can i haz broadwell?

    Reputations:
    2,962
    Messages:
    8,231
    Likes Received:
    63
    Trophy Points:
    216
    A standard USB port is rated at 5V, 0.5A. Chances are you can probably draw a bit more current from said USB port, but it's not a good idea to overload these things. Depending on how they're configured, powered USB ports may be able to dish out substantially more current through the standard pins, but the 5V figure should always be the same regardless of the make of your jack.
     
    Commander Wolf, Aug 7, 2009
    #2
  3. ramgen

    ramgen -- Morgan Stanley --

    Reputations:
    513
    Messages:
    1,322
    Likes Received:
    1
    Trophy Points:
    55
    by using a voltmeter connected to the Vdd and Gnd lines of the USB port.


    --
     
    ramgen, Aug 7, 2009
    #3
  4. moral hazard

    moral hazard Notebook Nobel Laureate

    Reputations:
    2,779
    Messages:
    7,957
    Likes Received:
    87
    Trophy Points:
    216
    I tried that, got 4.99V.
     
    moral hazard, Aug 7, 2009
    #4
  5. Greg

    Greg Notebook Nobel Laureate

    Reputations:
    7,857
    Messages:
    16,212
    Likes Received:
    58
    Trophy Points:
    466
    Then it is fine.
     
    Greg, Aug 7, 2009
    #5
  6. c19932

    c19932 Notebook Guru

    Reputations:
    2
    Messages:
    57
    Likes Received:
    0
    Trophy Points:
    15
    Is it bad to have a constant 5v fan on whenever the laptop is on? What about 2 5v fans? is that really bad for the mobo
     
    c19932, Aug 8, 2009
    #6
  7. moral hazard

    moral hazard Notebook Nobel Laureate

    Reputations:
    2,779
    Messages:
    7,957
    Likes Received:
    87
    Trophy Points:
    216
    no, it's not bad.

    just check what current they draw.

    I am going to connect a small 5v 6mm thick blower fan directly to my usb power. And I would actually install the fan inside the notebook.

    Right now I cant get my hands on a fan that's small enough.
     
    moral hazard, Aug 8, 2009
    #7
  8. c19932

    c19932 Notebook Guru

    Reputations:
    2
    Messages:
    57
    Likes Received:
    0
    Trophy Points:
    15
    c19932, Aug 8, 2009
    #8
  9. moral hazard

    moral hazard Notebook Nobel Laureate

    Reputations:
    2,779
    Messages:
    7,957
    Likes Received:
    87
    Trophy Points:
    216
    wow is that a 6mm thick fan?

    Anyway I don't see what current it takes in the specs.
    But it's likely that it's under 0.5A so it should be fine.

    If you do get it, on the fan itself it should say the amount of current it draws.
    If it is more than 0.5A (which it probably isn't) then it could be too much for the notebook to handle. Would cause overheating probably and maybe even some damage after some use.
     
    moral hazard, Aug 8, 2009
    #9