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Thread: Powering your LCD Monitor

  1. #11
    FLAC evandude's Avatar
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    Quote Originally Posted by shotgunefx
    But I don't think the diode wouldn't do anything but needlessly drop some voltage and prevent reverse current which should never happen in this particular situation.
    I would just like to note that reverse current CAN flow through a regulator (at least the basic ones, like the 7812, fancier ones might not) I have made that mistake before. I connected a big capacitor AFTER a 5v regulator, thinking that even if the input voltage fell for a short time, the output should stay okay because if no reverse current flowed, the cap would maintain the output voltage for a short time. However, in practice, I discovered that is wrong... the voltage on the output drooped right with the input... I put a diode in series with the regulator input and everything was fine, since no reverse current could flow then.

    Also, as people have been saying, find an LDO... you can find 1.5A and 3A LDO's relatively easily, for $1-2 and it will greatly improve your minimum input voltage. Add a schottky diode on the input and you should be good to go...

  2. #12
    Constant Bitrate Juliemac's Avatar
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    A series diode is not needed on the input. Place a diode across the top of the regulator (arrow points to the input) so that the output cap can discharge across that diode when the input drops.
    Use some thing like an In4001, a 1a diode. Will work every time.
    1981 VW Scirocco, 2L 16v turbo. EEEPC 1000 running Mega Squirt and music.
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  3. #13
    Constant Bitrate Juliemac's Avatar
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    Quote Originally Posted by shotgunefx
    autospeed.com had a nice article on replacing the lilliput ps with a 7812 and a zener. I'll see if I can find it.

    UPDATE
    I've attached the 7812 based circuit.

    First off, I am by no means an electrical expert. Hell, I just know enough to be dangerous. Use at your own risk. You should test the completed circuit with a multimeter before hooking up anything important.

    Having said that, I've built this circuit (minus the zener) for other projects and it's always worked fine. Your mileage may vary

    Outside of the Zener, everything should be available at Radio Shack.
    1) 16v zener diode
    1) 7812 regulator
    1) 10 uf cap
    1) 100 uf cap
    1) 5W 1 Ohm resistor
    1) Heat sink, bigger is better
    With the above diagram (minus the resistor and a parallel diode from output to input) use the LM 1084 LDO 12V regulator. Works on my system very well.
    1981 VW Scirocco, 2L 16v turbo. EEEPC 1000 running Mega Squirt and music.
    Http://www.menloparkrandd.com/scirocco

  4. #14
    Low Bitrate Speg's Avatar
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    YOu guys are brilliant!!! My screen was crapping out during the day, so I hooked it to my OPUS, and today, not a single crap (from the screen anyway )

    Thanks once again guys!!!

  5. #15
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    Help me please!!! LOL i finally got my whole system fixed up (year in the making) booted it all and was driving. everything was fine when smoke started rollin out my dash. the power wire to my lilliput touchscreen - the shield was just melting off of it. I am a newb to this type issue - how can i fix this ?? do i need a dedicated circuit from car battery or make a new type of power cable for it or what??? thanx all

  6. #16
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by SPUNOUTKID
    Help me please!!! LOL i finally got my whole system fixed up (year in the making) booted it all and was driving. everything was fine when smoke started rollin out my dash. the power wire to my lilliput touchscreen - the shield was just melting off of it. I am a newb to this type issue - how can i fix this ?? do i need a dedicated circuit from car battery or make a new type of power cable for it or what??? thanx all

    Spunoutkid, with all due respect....CAN YOU NOT READ?

    This is not a question asking thread. Please remove your post make a new thread asking your question in the LCD section. To answer your question briefly you have a short somewhere...we need more details and possibly pics so please do as I ask above and make a new thread about it. Fell free to pm me with a link to it when you have made it and i will try to help.

  7. #17
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    sorry.

  8. #18
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by SPUNOUTKID
    sorry.
    WTF? DELETE YOUR POST! FOR CHRIST SAKE!

  9. #19
    Newbie pasic's Avatar
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    Quote Originally Posted by Scouse Monkey
    WTF? DELETE YOUR POST! FOR CHRIST SAKE!
    hehe ... anyway

    before jumping at it and hooking your lcd upto the opus or whatever power supply you are using make sure you use an ammeter to check how much power is being drawn from the psu to the computer, then adding on the MAX DRAW (listed on the monitor specs) of the lcd to determine if the psu can handle the extra current. (remmber total power = W = Amps x Volts)

  10. #20
    FLAC mbkowns's Avatar
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    I decided to be cheap on the wire for my Xenarc. Instead of buying a new cable I just cut the cig adapater one. If I need the adapter again which I won't I will resplice it back together. Anyway

    Ground on the wire is the outer strand and the positive is the white wire.

    I have this hooked up to a OPUS POL
    2005 Ford Mustang GT <- - - UPDATED PICTURES

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