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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

    It's possible. You could use either a linear regulator or some type of switching regulator. If you don't need much 3.3V current (not sure what the ATX spec is) then you could tap off of one of the 5V lines to keep power disipation to a minimum.
    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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    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

  4. #4
    Retired Admin Aaron Cake's Avatar
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    Cool

    Read my reply above. It says I don't know
    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."

  5. #5
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    Well, from the DC/DC psu specs I've seen, you could get away with 5A. Would you need anything else between the Maxim and the mobo or just hook the Maxim to one of the +5V lines and the Maxim's Vo to the mobo? This can't be that easy, can it?
    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
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    Originally posted by Tony S:
    <STRONG>Well, from the DC/DC psu specs I've seen, you could get away with 5A. Would you need anything else between the Maxim and the mobo or just hook the Maxim to one of the +5V lines and the Maxim's Vo to the mobo? This can't be that easy, can it?</STRONG>

    Acutally, it is that simple, you will need all the external components that Maxim reccomends. It might be worth your while to try to hook up an amp meter and measure how much current each line uses. (you have to break the connection to do this so it is easier said than done.) Most Motherboards have onboard regulators to generate their 1.75 volt or whatever adjustable core voltages. If that regulator is starting from the 5 volt line, there is a good chance you don't even need 3.3 volts! You can always take a good ATX motherboard. Pull all the 3.3 volt lines out of the connector, plug it in and see if it boots. You won't hurt anything, (don't quote me on this, I don't like hate mail or death threats.. :-)

    5 amps should be enough, assuming you are not using the fastest chip from a first generation lot of wafers, some of them require currents of 20 amps or more. If you are using a pentium 200, 5 amps should be more than enough.

    Jeff_
    MPEGBOX - Plexiglass Computer
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  7. #7
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    If you still need the ATX specs, this page might help:
    http://www.teleport.com/~ffsupprt/sp...X12VPSDGV1.pdf

  8. #8
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    I realize that there are the 5V to 3.3V ic's avialable from Maxim however, they require mounting on a board and additional hardware. Does anyone know of an easier solution, such as a direct stepdown converter to take 5V to 3.3V with out all the customized hardware?

    Shawn

  9. #9
    Constant Bitrate
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    Somehow I don't think its gonna be worth the time, but if anyone needs arise contact information let me know.

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