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Split Voltage

Discussion in 'General Electronics Discussion' started by renfley, Mar 7, 2013.

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  1. renfley

    renfley

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    0
    Mar 6, 2013
    Hey guys.. quick question for you..

    My goal is simple, i want to used a laptop power cord to power two 5 volt devices,
    one being a raspberry pi and the other is the lcd control board.

    Does anyone have any ideas or solution they could offer?
     
  2. davenn

    davenn Moderator

    13,833
    1,950
    Sep 5, 2009
    well for a start tell us what is the voltage rating of the Laptop power adaptor ?


    Dave
     
  3. renfley

    renfley

    5
    0
    Mar 6, 2013
    the adaptor in question is an old IBM

    Input: 100-240v ~ 1.5A-0.9A 50/60hz

    Output: 16v 4.5A
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    11,513
    2,651
    Nov 17, 2011
    You will need a 5V regulator. Otherwise you will fry your boards.
    What are the power requirements of the boards?
    For up to ~100mA a simple linear regulator based on an 7805 can do.
    If you need more than ~100mA per board you will want to use a switch mode regulator like e.g. this one.
     
  5. renfley

    renfley

    5
    0
    Mar 6, 2013
    well the first board is the M.NT68676.2A MONITOR CONTROL BOARD which is

    Requirement 12V DC/12V(built)/12V,5V(built in)/12V,5V,5VSB(built in)

    and then i need 5v for the raspberry pi! \

    The link for the Monitor control board is here

    http://www.vslcd.com/Specification/M.NT68676.2A.pdf
     
  6. Harald Kapp

    Harald Kapp Moderator Moderator

    11,513
    2,651
    Nov 17, 2011
    In your first post you mentioned 2 5V devices. According to your latest satement, you will need two separate regulators: 1*5V + 1*12V.

    By power requirements I meant: what is the current consumption of the boards?
     
  7. BobK

    BobK

    7,682
    1,688
    Jan 5, 2010
    The Raspberry PI can be powered by any 5V USB plug charger. You can get these for a couple of bucks.

    And are you sure you need that monitor board? The Raspberry Pi has hdmi video built in.

    Bob
     
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