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Thread: Laptop as carputer, hardwiring, power issues

  1. #11
    Constant Bitrate JuMpMaN6235's Avatar
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    Toshiba 1115-s103 Laptop Cracked LCD screen = CARPUTER
    http://cgi.ebay.com/ws/eBayISAPI.dll...MEUS%3AIT&rd=1

    That was my auction, But i ended it early because i found a replacement LCD... didnt recieve it yet but its on its way
    ----][--------][[-]][--------][[-]][--------][---][
    ----][-][--][-][-I-][-][][][-][-I-][---][---][I--][
    ----][-][--][-][---][-][][][-][---][--][][--][-I-][
    ][][][-][][][-][---][-][-----][---][-][--][-][--I][
    ----------------------][-Carputer-|====|75%

  2. #12
    Maximum Bitrate KyleYankan's Avatar
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    To explain the DC-DC adapter:
    If you wanted to use the standard plug, you would need an inverer. That turns 12v into 120v. then you plug your lapto into that. that big block on the laptop cord turns 120v into 12v. So oyu go 12v->120v->12v. The 12v adapter is just "12v". It wil lregulate the power to give you a "smooth" power. Basiacally filters out the bumps.

    Things you're going to want/need:
    Touchscreen
    Mouse/keyboard (miniaturized)
    Audio connection (hook it up to your stereo)

  3. #13
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    Quote Originally Posted by Chris31
    An example of DC-DC adaptor you may need.

    http://www.maplin.co.uk/Module.aspx?...dID=4&doy=26m3

    This plug in to the cigarette ligher socket and the other end plug in directly to the laptops power socket. You DONT NEED the AC adaptor anymore.
    So the above adapter doesn't go 12v-120->12v again? I don't see anywhere on that ad that says it's specifically DC-DC.. it has that big brick in the middle. How do you tell for sure?

  4. #14
    Maximum Bitrate KyleYankan's Avatar
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    Quote Originally Posted by boostd4
    So the above adapter doesn't go 12v-120->12v again? I don't see anywhere on that ad that says it's specifically DC-DC.. it has that big brick in the middle. How do you tell for sure?
    It doesn't specifically say that, but it is what it does. The big-brick in the middle houses all the cords special featues - change voltage, power rectifier, etc.

    BTW, the reason we try to avoid 12v->120v->12v is effenciency. Most converters have an efficency rating. This means how much power is tooken from the battery is actually transformed into the new type of power. My inverter has 90% efficiency. That means if it draws 10 amps from my battery, only 9 amps come out the other end. 1 amp is wasted as heat. A DC->DC unit has high effeciency.

    Here's how my setup works.
    12v->90% effeiency inverter->90%power supply.

    That means I have .9*.8 effency or 81% effency. That's not the best. For every 10 amps my battery loses, I only get 8.1 amps for the computer, and 1.9 amps is toasted as heat.

  5. #15
    Constant Bitrate JuMpMaN6235's Avatar
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    Quote Originally Posted by boostd4
    So the above adapter doesn't go 12v-120->12v again? I don't see anywhere on that ad that says it's specifically DC-DC.. it has that big brick in the middle. How do you tell for sure?
    That is DC-DC, its input is most likely 11-14, and you can pick whatever output your laptop needs 15,16,18,19,20, 22 and 24Vdc..... its goes
    12v DC -> 15,16,18,19,20, 22 and 24 DC

    another example:
    http://cgi.ebay.com/ws/eBayISAPI.dll...754615956&rd=1
    ----][--------][[-]][--------][[-]][--------][---][
    ----][-][--][-][-I-][-][][][-][-I-][---][---][I--][
    ----][-][--][-][---][-][][][-][---][--][][--][-I-][
    ][][][-][][][-][---][-][-----][---][-][--][-][--I][
    ----------------------][-Carputer-|====|75%

  6. #16
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    search for "laptop remote power" and you will find some answers.

    From what I can find, the only proven way that works is to solder wires onto your laptop power button (which may require hacking the case up) and running a momentary switch to the dash.

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