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Thread: 12v to 19v and some other question

  1. #1
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    12v to 19v and some other question

    hi guys
    I'm pretty new to all this car customizing stuff.
    A month ago I put in a active subwoofer and a radio.
    that went quite well,and was fun to do.

    Now I have an old laptop that has a busted keyboard and i was wondering how to install this in a car.

    I've nosed around the internet/forum but there is no real guide to this, and seeing as everylaptop is probably different i can assume why.

    anyways.

    my big question is: Is there a 12v to 9v adapter.
    I think its a bit lame to stick a sigaret-lighter converter that goes from 12v>230v>19v.

    I also wonder if it is possible to put in a secound battary,as a reserve one(still dont know why cars only have 1 battary), that loads when driving but only unloads into the laptop.

    and are there ways to unatach and extend the laptop screen(using the same powersource, ofcoarse) and attach it somewhere else (thinking of putting it on the viser) that way can use the laptop screen, and save me a screen-purchase and another powersource problem.

    I dont know if i'm looking at this the right way, but those seem to be the problems that come in mind.

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
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    Quote Originally Posted by jasonteunissen View Post
    my big question is: Is there a 12v to 9v adapter.
    Yes. Check the Carnetix power supplies in the store here.

    I think its a bit lame to stick a sigaret-lighter converter that goes from 12v>230v>19v.
    Inefficient, as well.

    I also wonder if it is possible to put in a secound battary,as a reserve one(still dont know why cars only have 1 battary), that loads when driving but only unloads into the laptop.
    You can, but it's really not worth the time, effort & expense, especially with a laptop that has its own battery.

    and are there ways to unatach and extend the laptop screen(using the same powersource, ofcoarse) and attach it somewhere else (thinking of putting it on the viser) that way can use the laptop screen, and save me a screen-purchase and another powersource problem.
    IT can be done, but again, it's far simpler to just use an external screen.


    Time to start perusing the FAQs. Link is in my signature.

    Welcome to our madness!
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  3. #3
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    thx for the quick reply, I;ll check your faq

  4. #4
    MySQL Error soundman98's Avatar
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    some stuff to add:

    there is a thread, think in the general section about wheather your carpc killed your battery.. so far, the only dead batteries reported were after over 10hours of usage..

    i don't think that a second battery is necessary, but that a opinion, and you know what they say about that..

    screens: extending it is a tricky deal-- most have done it to netbooks, so try to search for those..

  5. #5
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    I'll see if i can find an sxtended notebook screen.
    the whole reason i wanted to do the laptop carpc is to save money, it doesnt have to be the most powerful carpc around, I just wanted a fun challange.
    And i think buying an extra screen will kut into my nonexisting budget.

  6. #6
    Raw Wave
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    Consider a battery protector aka low voltage cut out (LVCO).
    The MW728 handles 10A (~$20).

    Quite a few of my posts provide various solutions (else suggestions) for latching relays with optional LVCO; increasing MW728 cut-out voltage (st'd is off @ 11.2V; on at 12.5V); additional batteries with "smart" isolators (usually a mere on-of relay).

  7. #7
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    i'm new here but i'm guessing a "low voltage cut out (LVCO)" kuts the power suply if your battery is below a certain point.

    I'll also look into that

  8. #8
    Raw Wave
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    Exactly.
    It can also be considered a HVTO - High-Volt Turn On because it turn on at 12.5V and above.

    If 11.2V off & 12.5V on are too high, it can be easily increased with diode(s) and a relay...
    Add a diode with (say) 0.3V to 0.7V "forward voltage drop" to its input. (Typical diodes like 1N400x (1N4001, 1N4004, 1N4007 etc) have a ~0.6V drop.)
    That drops the voltage by (eg) 0.6V hence tricking the LVCO (MW728) to turn off at 11.8V and back on at 13.2V (which requires the alternator to be charging).
    BUT - you then have the LVCO turn on a relay that power the load.
    The relay means (1) that you don't need a 10A or higher diode to carry the load current THROUGH the MW728, and (2) you can use a 15A, 30A, 200A etc relay for bigger loads.

    Other tricks include a push-button to bypass (short out) the diode so it initially turns on at 12.5V (for a normal full battery without engine running) but then cuts out at (11.2+.6=) 11.8V and does not turn on again until the battery exceeds 13.2V.
    But there are lots of possible variations to the above.
    And tricks to prevent the MW728 "cycling" due to battery variations. (I had a problem battery that dropped to 11.2V and then recovered to 12.5V - the MW728 was cycling on & off every 15 seconds!)

  9. #9
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    like i said i'm new to this stuff so trying to work out the problems as i go along.
    but thx for the info i will keep it in mind.

    I also found:
    Extending your laptop's LCD cable: FAQ

    veryhandy seeing as that i would like to use my screen.

    now all i have to do is find the 12v>19v adapter somewhere in my country or see if they deliver it to holland. (not a big fan of online shops)
    and also what the price ranges are.

    but seeing as we have the power,battary and screen problems "theoretecly solved" I will try and attempt to make this a reality.

    and then i start can worrying about software.....

  10. #10
    MySQL Error soundman98's Avatar
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    check the dc-dc power supplies first-- some have a low voltage cutoff adjustment-- these will shut off the pc more gracefully then other lvco's..

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