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Thread: Also Making a PSU

  1. #1
    FLAC
    Join Date
    Apr 2001
    Location
    Portland OR
    Posts
    1,244

    Post Also Making a PSU

    I too am making an ATX power supply and at the moment im going with the following specs:

    Input:
    8 - 14 volts DC, non regulated

    Outputs:
    12v @ 2.2 amps > 75% efficient @ 12 volts in
    3.3v @ 5 amps > 80% efficient @ 12 volts in
    5v @ 4.8 amps > 85% efficient @ 12 volts in
    -12 volts @ 0.1 amps
    -5 volts @ 0.1 amps

    Power output approx = 67.9 Watts
    Power input = 81.48 Watts (80% efficiency at rated load.)

    Typicial Full load Input Current = 6.79 Amps @ 12 volts.

    Plus I would make it compatible with the ATX standard ie. all atx signals (power good, power standby, and power on)

    If I had double sided plated boards built and the whole thing was about 3.8" by 2.5" by 2" with an aluminum heatsink/casing, would people be interested in buying one? How much would anyone pay?

    I was also thinking of having the -5 voltage be an adjustable one so that if you didn't need the -5 and you needed say, -8 you could do it.

    What do ya think?

    Jeff_
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  2. #2
    Newbie
    Join Date
    Jan 2001
    Location
    Somerset, UK
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    14

    Talking

    I would definatly be interested in buying one, and i'm sure quite a few other people would be as well. An ATX PSU is the only piece of equipment I need to finish my carputer. I have been reluctant to build one myself since i'm not that confident with a soldering iron in my hand. Name your price and i'm sure I will be interested.

  3. #3
    Maximum Bitrate albysure's Avatar
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    Dec 2000
    Location
    pittsfield, ma.
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    685

    Post

    count me in. i am looking for a ps now

  4. #4
    Maximum Bitrate
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    Jan 2001
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    Adelaide, SA, Australia
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    Post

    yeh me too! as for price, well work out what its gunna cost u to produce, add some margin, and that will be the price
    http://www.mp3vl.tk Plans and progress on my install - (Updated 28 June 02)
    Australian mp3car Portal
    mp3car related links Check them out / Add some
    mp3car FAQ - RTFF

    [########==]80% Assembling
    -=Current Progress: Working Sproggy supply, building box.=-

  5. #5
    FLAC
    Join Date
    Apr 2001
    Location
    Portland OR
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    Post

    I'm working on it, I am going to order some boards pretty soon here. I'll let ya know when I get everything working!

    Jeff_
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  6. #6
    Newbie
    Join Date
    Jun 2000
    Posts
    10

    Post

    I am extremely interested in a power supply too! Please add me to any notifications you may be sending out. Thanks!!!

    Gabbi
    [email protected]

  7. #7
    Variable Bitrate
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    Jun 2001
    Location
    netherlands
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    Post

    if its affordable i am interested too !
    time for the sig:

    '00 VW golf TDI upped to 130 HP - 18" RS 6 wheels - liliput 7" tft in indash housing - epia 10K - SB audigy - caliber 1 fahrad CAP - RF punch amp - hollywood 1.6K mono amp - boston acoustics pro - RF 10" DVD sub

  8. #8
    Variable Bitrate
    Join Date
    Mar 2001
    Posts
    292

    Post

    Jeff, you know I'm interested. It's the only thing keeping me from going to Suspend To Ram.
    Player: Celeron II 633MHz, 256MB RAM, 20GB IBM 9mm 2.5" Laptop HD (180G/2ms), onboard ethernet/sound/video/tvout, 10"11"x3" case, MPBS1 70W DC-DC PS w/auto-shutdown controller, in-dash lighted switches, 7" NTSC TFT widescreen in-dash LCD, touchscreen, rear-window brake light installed Garmin GPS35 GPS, credit card sized IR remote w/IRMan, mini-wireless keyboard/mouse (sits under seat), PowerMate black knob, MP3s and GPS Navigation (Winamp, CoPilot, SA8.0).
    Car: 1993 Nissan Maxima, Black Emerald

  9. #9
    mpt
    mpt is offline
    Constant Bitrate
    Join Date
    Jun 2000
    Location
    Setubal, Portugal - Europe
    Posts
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    Post

    I am doing this one: http://home.primus.com.au/bravo/Carp...bjcarputer.htm
    Itīs a switching power supply, very efficient, it doesnīt need a transformer, only some inductors (easy to find or to make at home), itīs simple, and parts are not very hard to find, at least where i live.
    Thanks to Bj, credits goes to him.

    Greetings
    mpt

  10. #10
    FLAC
    Join Date
    Apr 2001
    Location
    Portland OR
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    Post

    Still working on my atx power supply, (even though my car player was stolen..) Here is the layout, I still have some changes to make.
    My ATX supply layout

    The supply is going to be 3.5 inches by 2.8 inches. (very small with lots of surface mount parts..)

    It is going to have
    +5 @ 5a
    +12 @ 2a
    +3.3 @ 5a
    +5standby @ 0.25a 0r 1.5a (low power regulator or plain 7805 (350))
    -12 @ 100mA
    Adjustable -1.25 to -12 @ 100mA (default = -5)

    Also has Power_good, and soft_on pins.

    Jeff_
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

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