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Thread: Other Voltages from DC-DC PSU?

  1. #1
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    Question Other Voltages from DC-DC PSU?

    Anyone who starts up the flamethrower whenever inverters are mentioned, pay attention. In order to avoid using an inverter in my system, I need to know how to get 4V and 6V from a DC-DC PSU. Once I can pull that off, I won't have any reason to use an inverter in my rig.

    Actually, now that I think about it, whatever works with a DC-DC would probably work with an AC-DC PSU as well. Anyway, if anyone has a suggestion, it would be most appreciated.
    The Ultimate Low-Budget MP3mobile
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  2. #2
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    Well getting the 6V isn't a big problem. Just run a MC7806 6V voltage regulator to get it. The 4V is a smidge more tricky. You may want to use a LM317 adjustable votage regulator to get it.

    Just a thought...

    j
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  3. #3
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    Question

    Thanks for the tip, j. Unfortunately, I don't know enough about electronics in general and IC's in particular to do anything with your advice.

    I do know how to solder, and if you or someone else could make up a schematic, I could probably manage to follow enough to put the thing together.

    I would really appreciate the help. I have posted this question on a couple of other boards, and have promised that whoever can help me first gets their name inscribed on the finished box. Don't know if anyone cares, but I figure I'd at least give credit where credit is due.
    The Ultimate Low-Budget MP3mobile
    "The Millennium Gerbil" (work in progress)
    '92 Geo Metro
    Brown/White 2-Tone (at least till I wash it)
    IBM P90, 48MB RAM, HD's: 420MB, 420MB, 810MB, 1.2GB
    Win98Lite, WinAmp, IBM WorkPad c3 running PalmAmp for Input/Output

    And the world's greatest theft-deterrent system.

  4. #4
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    Here give this a try. I have to warn you though I haven't tried it personally, but it should work. :-)


    (If the image doesn't show up go to here: http://members.nbci.com/littlej02/6V4VPS.jpg. You're probably going to have to type in it manually. Stupid NBCI doesn't want to link very well.)

    j
    j
    j's MP3Car.com Web Site
    [######----] 60% complete (1st try)

  5. #5
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    Hi Mr. Niceguy,
    Go to the National Semiconductor website and look up the LM317 Adjustable 3 Terminal Positive Voltage Regulator. Build 1 for each voltage you need. They can be bought at Radio Shack for a couple of bucks each (no I don't work there!!)
    Good luck!

    Mike

  6. #6
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    Thanks folks. I appreciate the help.
    The Ultimate Low-Budget MP3mobile
    "The Millennium Gerbil" (work in progress)
    '92 Geo Metro
    Brown/White 2-Tone (at least till I wash it)
    IBM P90, 48MB RAM, HD's: 420MB, 420MB, 810MB, 1.2GB
    Win98Lite, WinAmp, IBM WorkPad c3 running PalmAmp for Input/Output

    And the world's greatest theft-deterrent system.

  7. #7
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    Exclamation

    A LM317 is not stable enough nor will it provide enough current to power most motherboards. Look at the spec.

  8. #8
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    Well according to the datasheets for both the MC7806 and the LM317 the max output current for both is 2.2A. Not that you would EVER want to run these at maximum, but typically 1.5A isn't tough for these things to do. One just has to make sure that they have a heatsink on them to dissapate the heat that these things could generate at such high current levels.

    As far as using these to run motherboards, I don't think that was ever a requirement from MrNiceguy. I'm not sure what he wants to use +4V and +6V DC for, he just wanted to know how to get them and I thought that maybe the MC7806 and the LM317 could possibly work for him. He didn't mention any current requirements either, otherwise I may have suggested something else.

    I just wanted to help...

    j
    j
    j's MP3Car.com Web Site
    [######----] 60% complete (1st try)

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