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Thread: Circuit Diagram for simple DC2DC Adaptor

  1. #1
    Join Date
    Oct 2004

    Circuit Diagram for simple DC2DC Adaptor

    Hi, I've stumbled onto these forums in my research into In-Car PCs. I know you guys are pretty knowledgable on PSU's so here's my question:

    I need to make an adaptor that will put out a regulated 12V at around 1.5A. Reason being is I am trying to power an LCD monitor that has a 12V 13W requirement. I don't want it to switch off when the power drops below 12V, so I'm guessing I'll need some sort of capacitor etc.

    I've been able to find circuits that allow 60W etc, but none that's low power. I've looked around in the shops and the regulated power supplies are all either too powerful for my needs (and therefore too expensive) or have an output that's not enough (800mA most of them were). Any ideas guys?

  2. #2
    Maximum Bitrate SAScooby's Avatar
    Join Date
    Feb 2004
    Johannesburg, South Africa
    two 800ma in parallel ?
    Nano ITX / 512 MB / 60 GB / Panasonic slot load / M1-ATX / Bu303 / Sound blaster 24 / PPi amps / rockford sub

  3. #3
    Join Date
    Oct 2004
    haha 1.6A possibly, but I couldn't find any 800mA adaptors that were also regulated.

  4. #4
    See me in my wet t-shirt. stevieg's Avatar
    Join Date
    Aug 2003
    Warwickshire, UK
    Have you thought about running 12V off the Car PC psu, which should already be regualted depending on your setup?
    Ford Focus MP3 : Blog Updated 29 January 2009!
    Car PC Status: Complete - Undergoing Software Redevelopment

  5. #5
    MySQL Error MatrixPC's Avatar
    Join Date
    Sep 2003
    Beach City, Socal
    Check Mastero/Sprogy power supply thread and get a 12V section from there. It capable of 5A.
    2004 Matrix XR A7N8X-VM/400 AMD XP-M 2500+, DS-ATX
    89 Supra Turbo P3 600E@750/Abit BE6 II, Alpine M-BUS Car2PC.
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  6. #6
    Raw Wave Rob Withey's Avatar
    Join Date
    Apr 2000
    Bedfordshire, UK
    I use a PT5071 integrated switching regulator to get 12v at 1.5A. Very easy to use, very efficient, copes with a wide input range, and includes a switch on/off pin. There have been a few circuits posted that use the PT5071, including my current power supply (see my webpage).
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

  7. #7
    Low Bitrate
    Join Date
    Nov 2003
    Apeldoorn, Netherlands
    I love the pt5071
    Newbee, sorry for my bad english. lol
    Trying to built a carmp3 systeem

    own psu: max788, pt5071, pt5024

  8. #8
    Join Date
    May 2004
    How about one of these:

    I'm going to need one for my screen too along with a 5V@5A regulator for my external DVD and usb2.0 hub. Instead of the LM317, I might build them myself with the LM350 or LM1084 which is rated for 3A and 5A.

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