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Thread: powering the lilliput?

  1. #1
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    powering the lilliput?

    Right, went to buy one today (2nd hand) and the "egg" blew.
    so how can i power it correctly now?
    would something like this work? http://cgi.ebay.co.uk/ws/eBayISAPI.d...981341646&rd=1

    ideas welcome

    p.s right now ill be using a laptop as the pc, so no PSU.

  2. #2
    Low Bitrate phord's Avatar
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    No, because the Lilliput egg puts out 12v, not 15-24v.

    I power mine directly from my Opus 150W PSU. I just connected the leads directly to a 12v output on one of the drive PS connectors. Make sure you get the polarity right. Mr. Voltmeter is your friend.

    Oh -- and first next time.
    Best way to power the liliput touchscreen?
    Carputer-II: Infiniti Q45
    Simple setup, NAV-only
    Tablet PC :: FP :: iGuidance
    Status: Ghetto, baby!

    Carputer-I: '99 Honda Odyssey
    Dual monitor, separate outputs: Finished
    FP :: iGuidance :: WinDVD :: EPIA M-10000 :: Opus 150w :: In-dash/On-dash

  3. #3
    MySQL Error Scouse Monkey's Avatar
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    Well it would work if it did 12V out:

    Output:
    * DC 15/16/18/19/20V 3.5A max.
    so no. But it might work with your laptop depending how much power it needs. Trust do a 120W dc-dc for laptops you might want to look at for the laptop.

    As for screen you need a 12V output regulator or your could make one - there are some shcematics on here for simple 12V dc-dc regs.

    EDIT: try looking in the "powering your screen" sticky or int he hardware dev or psu sections

  4. #4
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    i did use the search but only ppl say about using the opus psu, which i wont be using as im gonna use a laptop, so i decided to start my own thread and ask.

    the lilliput accepts dc fine then? dosnt have to be ac?

  5. #5
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by SteveS
    the lilliput accepts dc fine then? dosnt have to be ac?
    of course it takes DC. It comes with a dc-dc reg for use in the car and an ac-dc converter.

    I am pretty sure it will also say the voltage requirment on the back or at least in the manual.

  6. #6
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    i was buying 2nd hand, but didnt because of the egg blowing, so dont have the egg or box with me to look, so better ask than buy somethin wrong..

  7. #7
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    tried looking on how to build a regulator but not having much luck?

  8. #8
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by SteveS
    tried looking on how to build a regulator but not having much luck?
    God help me!

    Quote Originally Posted by Scouse Monkey
    try looking in the "powering your screen" sticky
    Powering your LCD Monitor

    there is one there. Or there are other designs. I am pretty sure you can find a 1A 12V reg at your local electronics store.

    did you read this int he mentioned thread? Take note of the bit in BOLD

    Quote Originally Posted by Scouse Monkey
    POWERING YOUR SCREEN OFF YOUR PC POWER SUPPLY:

    Although certain screens may be quorisk of prematurely killing your CCFL (if not the rest of the components) as the CCFL quite often goes brighter when the screen is connected direct to a car battery (>14V) compared to a 12V supply. This shows there is no or poor regualtion of the input voltage which may cause damage. It shouldn't do as the manufacturers should be underating the inverterif this is the case but regardless your car is not a clean 14V supply and has a lot of spikes and noise - especially during cranking.

    It has been widely accepted that the best way to preserve your LCDs health and also a quick and easy way to make sure it turns off and doesnt drain your battery (even in standby it will drain your battery - all be it slowly) is to power it off the 12V line onf your PCs PSU.

    On a molex conenctor this is the Yellow wire (12V +ve) and you also want to use the adjacent black wire for -ve.

    If you power your monitor in this way you do not have to use the 12V regualtor that comes with it - doing so as well may introduce noise and also cause your screen to be dimmer due to a voltage drop. It is also one more thing to go wrong.

    The power of most 250-400nit 7" LCD monitors, and indeed 8" models, is about 10W which is about 1Ated as being able to run off 12-24V it can be seen that there is a on your 12V line so make sure you have enough power for it.

    If you don't you can use a cheap and simple 1-1.5A 12V DC-DC regulator such as those that come with some screens or ones you find to power portable DVD players. 1200mA models are quite common. These can normally be connected to your ACC line (switched 12V line your HU) as the power is low or you can connect them direct to the battery via a relay that is powered by your PCs PSU or the ACC line. The ACC line or relay and ACC line may be prefered so your screen does not stay on after you have left the car and the Pc is shutting down.

    Some of the DC-DC regualtors that come with the screens may be okay to use - you don't have to go out and buy a new one but if possible check the voltages coming from your supply while the engine is running and also check for the screen going brighter when the engine is revved.

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