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Thread: MPBS1 ATX 12V DC-DC Power Supply

  1. #1
    FLAC
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    Apr 2001
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    Post MPBS1 ATX 12V DC-DC Power Supply

    Here are some of the pics of the supply I built.

    Random Pictures of MPBS1 ATX Power Supply

    Here are the Specs:

    Input:
    8 - 14 volts DC, non regulated

    Outputs:
    12v @ 2.0 amps > 75% efficient @ 12 volts in
    3.3v @ 5 amps > 80% efficient @ 12 volts in
    5v @ 5 amps > 85% efficient @ 12 volts in
    -12 volts @ 50 mA amps
    -5 volts @ 50 mA amps
    +5 Standby 0.5 Amps (option #1)
    or
    +5 Standby 1.5 Amps (option #2)


    Standby Current (main rails off no +5VSB load) < 0.5 mA (option # 1)
    or
    Standby Current (main rails off no +5VSB load) < 10 mA (option # 2)

    Operating Current (no load) = < 150 mA

    Power output approx = 70 Watts
    Power input approx = 82 Watts (80% efficiency at rated load.)


    I'm still not sure what to charge for the kit/supply. I am going to sell 2 of them for 90 bucks so I can get back some of the costs of development. I have spent over 60 hours designing and testing, but I don't know if I can order the parts in the quantities I need so that it costs me less than 90 bucks to build them. (it takes at least 2-3 hours soldering if you do it right) I will defiantly be selling kits. One option is to provide the board, heatsink housing, and maybe some screws. Along with a detailed guide and parts list. All of the parts can be ordered from www.digikey.com, but it looks like if you buy them in small quantities, it will cost about 90 bucks in parts.. :-( (and digikey is probably not the cheepest place to buy them, but they have everything.) If you wind your own coils, that will shave off 15 bucks on parts and if you get the main 4 ICs from Santa, that will shave off another 30 bucks.

    Jeff_
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  2. #2
    FLAC
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    moahdib's Avatar
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    I want it!!!
    04 Acura TL w/ core2duo 2ghz laptop w/ 1gb RAM on a docking station.

    Fast car, fast PC. ;)

    http://www.arcdesigns.net/carpc/

    My TL CarPC ver2

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  3. #3
    FLAC
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    Upper Marlboro, MD 20772
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    Cool

    Sign me up...Can u send me the info. I want to build one this summer for my next project. Can this psu power up my setup. Infact, if you where to rate your PSU against the arise ACE-865v what would you say.
    abcd-1
    Author of CobraI,II,III and now CobraIV.
    You can contact me on AOL instant messenger....nick is cenwesi or cenwesi3

  4. #4
    Registered User
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    Post

    i want one too!!!!!!!!

  5. #5
    Constant Bitrate
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    Post

    I am also very interested. If you could e-mail me or info on order or obtaining directions. [email protected]

  6. #6
    FLAC
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    Post

    Can this psu power up my setup. Infact, if you where to rate your PSU against the arise ACE-865v what would you say
    Well, I don't know much about the Arice 865, but It looks like it has 1 more Amp on the 5 volt line, and a little more current on the negitive supplies. It is also an AT supply.

    You could eaisly rig this supply up to not supply 3.3 volts and instead supply 5 volts at 10 amps (just like the sproggies). Also, you can bypass or not use half the atx stuff on this board. As far as size, this supply is 3.8 by 2.5 by 1.2 inches small. I'm not sure how big the 865 is however. If the Arise 865 is only 60 bucks, it is a pretty good deal, but if you need an ATX supply that is tiny, (which is why I built it) then this one does the trick. I would say that this supply is the ATX version of the 865. But the design is probably vastly different. I still need to characterize noise and heat and test it in a car, but I am really confident thus far.

    Jeff_


    Jeff_
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  7. #7
    Variable Bitrate
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    Post

    Jeff: Looks like you got a real business on your hands now! If you're going to make a few, I would be interested too.

    Also, (I'm sure you've tested it on a car already but...) you mentioned that it takes input voltage of anywhere from 8-14VDC but don't most american and japanese cars operate at 14.4V while they're running? Or is that not enough to make a difference?
    95 Honda Civic DX Coupe - In Progress
    mp3civic site

  8. #8
    Oms
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    Sign me up for the kit form please!
    Custom Linux system on an '89 VW GTI 16V Edition One
    Jogdial volume control, Sony joystick, IR remote...
    Used to be the fastest Linux on the road, until all these NOS types came along...

  9. #9
    FLAC
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    1,612

    Post

    Originally posted by schrodos:
    <STRONG>you mentioned that it takes input voltage of anywhere from 8-14VDC but don't most american and japanese cars operate at 14.4V while they're running? Or is that not enough to make a difference?</STRONG>

    good quetion because my car idles at 13.98vdc and i'm sure it gets higher as you accelerate

  10. #10
    FLAC
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    moahdib's Avatar
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    Jeff have you done the in car test yet?
    04 Acura TL w/ core2duo 2ghz laptop w/ 1gb RAM on a docking station.

    Fast car, fast PC. ;)

    http://www.arcdesigns.net/carpc/

    My TL CarPC ver2

    FSR Flash Skin w/ moving weather maps

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