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Thread: Small, cheap, 12V-12V regulator

  1. #1
    SuperMod - OBDII GPS Logger forum
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    Small, cheap, 12V-12V regulator

    Possibly related to this post I just made

    What's the smallest/cheapest 12V-12V regulator out there? I don't want an ATX power supply, I just want something like the Carnetix P5V, but with twelve volts out instead of five.

    Can anyone advise?

    The Carnetix section of the mp3car store doesn't seem to contain anything appropriately small and cheap, nor the PSU section. I looked at mini-box website and all their really small PSUs appear to be ATX form factor - hardly convenient when what I really want is two wires, one that spits out electricities and one that takes them back in again.

    Thanks,
    Gary (-;
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  2. #2
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    Of course, I write that and then I go find this bad boy:
    picoUPS 120 12V DC micro UPS

    What do you think? It's not available on the mp3car store, but it looks like even if I don't put a battery on it, it'll do what I want. For bonus points, I could put a battery on it and actually enjoy a UPS for my pogoplug...

    Gary (-;
    OBDGPSLogger, for logging OBDII and/or GPS data
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  3. #3
    FLAC
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    http://store.mp3car.com/Intelligent_..._p/pwr-034.htm
    this is a nice option too depending on your need

  4. #4
    FLAC
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    How much current do you need? eBay has some switching regulators that do 1A for <$20.

  5. #5
    SuperMod - OBDII GPS Logger forum
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    Punky: I actually have one of those at home, but for this particular project I'm shooting for something smaller.

    Nobb; nominally 8W, although startup will possibly be a bit more. [so... two thirds of an amp, but possibly more than 1A]

    Gary (-;
    OBDGPSLogger, for logging OBDII and/or GPS data
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  6. #6
    FLAC
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    you can do that using a single tiny regulator, there'll be a bit of heat thats all.

  7. #7
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    How would that work?

    The truth, of course, is that now I'm thinking about putting in a UPS on purpose...

    Gary (-;
    OBDGPSLogger, for logging OBDII and/or GPS data
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  8. #8
    Raw Wave
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    I think Punky is forgetting the drop-out voltage as well as up conversion.

    FYI - a versatile kit for up to 50W, or 100W heatsinked (AUD$22.50 + P&P) - see Oatley Electronics Kit K168 - DC to DC Converter

  9. #9
    FLAC
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    I remembered looking this up at one point. I think this chip can do it:
    http://www.national.com/ds/LM/LM138.pdf
    However, for the cost, oldspark's suggestion will most likely be cheaper and easier.

  10. #10
    Raw Wave
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    The LM138 drops at least 1.5V across it, hence you need 13.5V in to get 12V out. (It's similar to the LM117/317, 780x & 790x 3-terminal regulators.)

    In this application, being a UPS I assumed a typical 12V supply to supply 12V, hence say 11V - 15V in assuming a battery, or 8-16V in using typical automotive design specs.

    If that regulation wasn't required, why not connect 12v to 12V?

    Pity though - for 8W, cheap $2-$3 fixed 12V 7812 or adjustable 317k regs would do (up to 1.5A output).

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