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Thread: Convert Arise AT to ATX?

  1. #1
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    Post Convert Arise AT to ATX?

    I was curious, would it be possible to convert the arise DC/DC AT power supply to ATX? Perhaps using a 8-16VDC to 3.3V converter on one of the 12V lines then rewiring the cable to a standard ATX P1 connector?

    I know u wouldnt get auto turn on or soft off but if u manually turned the unit on or off it would turn the board on would it not?

    Shawn

  2. #2
    Retired Admin Aaron Cake's Avatar
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    Cool

    How much 3.3V power is needed? You can connect an LM series regulator to the 5V line (keeps power dissipation low) instead of the input of the supply. There are TO-3 style regulators which will do 5A.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
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  3. #3
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    Hi Aaron,

    Thanks for the info. Any idea where the regulators are available? I have the AT and ATX power specifications here, in a perfect world all we should have to do is rewire the cable, add the regulator and be on the way.

    Shawn

  4. #4
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    Hey Aaron,

    Any idea what the required current is for an ATX motherboard? Maxim makes many step down converters for the 5V to 3.3V DC but they are all at different amperages. Any idea?

    Shawn

  5. #5
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    Actually, you'd be better off taking one of the 5V lines and using that for the 3.3V. On my AC/DC in my current home PC the psu MAX rating for 3.3Vo is 10A. Of course, it's probably not using all 10A but the most amperage out from a 3.3V regulator on Digikey or Mouser I've seen is 2A, and that's max. I'm starting to think the Dc/Dc convertor just ain't gonna happen for me. Look like the DC/AC/PSU is more a reality for me at this time.
    P4 2.4GHz, Intel mobo w/onboard sound & video, 128MB memory, 100GB Seagate Momentus laptop drive, Xenarc 700TSV 7" touchscreen, IRman using Girder, 150W Opus dc/dc psu, Alpine CDA-9835 h/u, MBQuart speakers, Infinity 15" sub, MTX amps.

  6. #6
    Retired Admin Aaron Cake's Avatar
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    Cool

    Sounds like you won't need more then 5A at 3.3V. Take a look at the LM338K. This an adjustable regulator in a TO-3 package that can handle a maximum of 5A.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

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