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12VDC to 19VDC

Discussion in 'Electronic Basics' started by Melaniegree64694, Jul 9, 2003.

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  1. Hi
    There is no Laptop facility in my car only a 12v spare lead. I was wondering
    if someone knows a reasonably simple way to up this to 19v as I have a friend
    who can wire things up (without to many bangs).

  2. Kasper

    Kasper Guest


    try to seek on step up converters....

    some just ned a coil.. but i guess you nedd about 2,5 A so maybe not easy to
    find one that can hadle that much without external switch transistor
  3. You need a switching DC-DC voltage converter. There are many available.

    Search on "DC DC voltage converter" on the web.

    -Chaud Lapin-
  4. David Yates

    David Yates Guest

    I think it is TravelMate who make these. . the problem is, I need both arms
    and legs to use a laptop and after you buy one, you'll only have one of

    They are very much over priced obo the number of components they contain. I
    paid about AU$160. ACER have these rebranded, I think. They plug into the
    cigarette lighter. Should be easy to build if you are into electronics?

  5. Since it is a laptop, it's likely that it draws a fair amount of
    current. Normally, you pretty much buy a car adapter from the
    laptop company or one of their dealers. It's not worth risking
    your laptop, as a rule, with borrowing a design from some other
    purpose or doing your own unless you are pretty adept at this.

    One shop in the UK is:

    Just found it from google, so no idea if they are a good place
    to shop. You should be able to find a great many of these shops
    through google, using searches such as

    car adapter laptop|laptops

    for example. Also, you might add in keywords like
    'schematic|schematics' or 'dc' or 'dc-dc' or 'homebuilt' into
    the list to refine it for usable schematics.
    I should be doing more favors for friends like you, Mel! ;)
    Who knows? My wife might even approve.

    Best of luck,
  6. the Wiz

    the Wiz Guest

    The laptop typically needs 19 volts at 3 amps or more. That's more than 60
    watts delivered power- and it needs output voltage regulation, input and output
    filtering, and overcurrent, overvoltage, and overheat protection.

    Don't forget that "12 volt" automobile power is only nominally 12 volts. It can
    drop to less than 10 volts during starting and rise to 16 volts during charging
    (depending on a number of factors).

    More about me:
    VB3 source code:
    VB6 source code:
    VB6 - MySQL how to:
    Drivers for Pablo graphics tablet and JamCam cameras:
    johnecarter atat mindspring dotdot com. Fix the obvious to reply by email.
  7. Hi
    Thanks for the replies

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