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Thread: electronic Guru's needed ...

  1. #1
    Variable Bitrate felix99's Avatar
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    Question electronic Guru's needed ...

    Hi,
    I currently have some projects running and some plans I found are not complete so what I need is:

    A Stabilisation circuit (with filers if possible) to get 12V as proper as possible. ( sorry I dont know the english special term)
    My dictionary says smothed - so I need a proper smothed 12V .

    Why this ? - I have some noise on my TFT , only in car , at home on a stabilzed 12V Power supply tehres no noise.
    I also have a raw TFT where I have to build a controller for and I want to integrate the needed cicuit directly in it .

    Any cicuits , hints etc.. that could help me ??

    Thanks

    Felix

    Hope I expressed myself understandable .- sorry if not.-
    =>> Carpc Version2 -- Epia M 10K based<<=
    ::Epia M10k,7"VGA/40GB2.5",GPS,Opus90W ::
    ::trying to build second low cost carpc::
    ::Automp3.de :: CAR= Renault Clio2 - 2 seats 1.9D

  2. #2
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    Can you power the screen off of the computer's 12v power? That's what I do. As a bonus, the screen shuts off with the computer automatically.
    -Seanster

  3. #3
    Variable Bitrate felix99's Avatar
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    Thanks for replying ,

    Problem is that i need the screen also when PC is off-
    And the other screen I' wanna buil a controller for is for stand alone use ( without pc) . Thats why I need this

    Felix
    =>> Carpc Version2 -- Epia M 10K based<<=
    ::Epia M10k,7"VGA/40GB2.5",GPS,Opus90W ::
    ::trying to build second low cost carpc::
    ::Automp3.de :: CAR= Renault Clio2 - 2 seats 1.9D

  4. #4
    Low Bitrate
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    A large capacitor(s) and a LM7812 regulator should make a good enough smoothing circuit. Try perhaps a few 2200uF capacitors in parallel, make sure they are rated at 25v minimum. Don't worry about your spelling, it's actually very good. I have seen english people who are much much worse!
    Best regards,
    Matthew

  5. #5
    Variable Bitrate felix99's Avatar
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    Thanks

    The capacitors before or after the LM7812 ??

    Tnx

    Felix

    //edit

    perhaps - an idea came to my head- i could take the 12v part from sproggy psu ??


    \\edit end
    =>> Carpc Version2 -- Epia M 10K based<<=
    ::Epia M10k,7"VGA/40GB2.5",GPS,Opus90W ::
    ::trying to build second low cost carpc::
    ::Automp3.de :: CAR= Renault Clio2 - 2 seats 1.9D

  6. #6
    Newbie
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    I checked out your site and I can't tell what you would be doing with the screen when the computer is off. And what is the other screen for? Just nosey...

    If it was me, I'd just plug another power supply into the inverter :)
    -Seanster

  7. #7
    Variable Bitrate felix99's Avatar
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    the inverter just supports one - if i connect AT PSU it cuts off after 28min

    I have a digital camera and i wanna look at the pics / videos i take via the tft and a friend of myself has one of those multimedia discmans which are playing mp3'cds vcds svcds - when we have long travels he alwas brings a good movie or new mp3s - ( the discman works via TVout gui .
    I also planned a backview camera

    The other TFT is for my parents car. will get them one of those discmans and build them a tv tuner - later a carpc

    thats why
    Felix
    =>> Carpc Version2 -- Epia M 10K based<<=
    ::Epia M10k,7"VGA/40GB2.5",GPS,Opus90W ::
    ::trying to build second low cost carpc::
    ::Automp3.de :: CAR= Renault Clio2 - 2 seats 1.9D

  8. #8
    Variable Bitrate mp3hombre's Avatar
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    Get yourself a 15 VDC 1 Amp adapter, a 4700 uF capacitor and a 12 V 1 Amp voltage regulator.
    The capacitor goes before the voltage regulator, just make sure to wire them correctly and put them in a small plastic box.

  9. #9
    Low Bitrate
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    Put 2200uF capacitors before the regulator and perhaps some smaller capacitors (10uF) after the regulator. The LM7812 is rated at 1A but you can put more of them in parallel for higher current.
    Best regards,
    Matthew

  10. #10
    FLAC Mastero's Avatar
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    insted of the LM7812 you can go for LM1084-12 its rated at 5amps and is linear ..

    Mastero

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