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Thread: 80W Opus PSU, Did I screw up?

  1. #1
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    80W Opus PSU, Did I screw up?

    I guess I didnt put quite as much research as I thought I had into this.

    I bought the Opus 80W 12V/5V PSU, but it doesnt have an ATX connector. Is it possible for me to power an Epia V8000A off this, or do I have to get one with with ATX connector?

  2. #2
    Variable Bitrate Curly_cat's Avatar
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    You'll either need to swap it for an OPUS that has an ATX connector, or, use the 80 Watt one in conjunction with a DC-DC power board that requires 12V input.

    A DC-DC board like this one would be fine:


    : Jetway J7F2 1.5Ghz Mainboard : Cubid 3688 : CarNetix CNX-P1260 :
    : Netgear 802.11g PCMCIA : 2 x LinITX 7" Screens :
    : BU353 USB GPS Mouse : Panasonic UJ845 DVDRW :

  3. #3
    FLAC
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    use the 80 Watt one in conjunction with a DC-DC power board that requires 12V input.
    Shame on you Curly Cat. The Opus 80W can only provide 3.3 amps at +12V...

    Now the CarNetix P1290...
    MikeH

  4. #4
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    Is there any way around this?

    Or do I have to mail it back, take a %15 restocking fee and buy the Opus 120?

  5. #5
    Tainted Love Cris's Avatar
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    How can it not have an ATX connector?

  6. #6
    Constant Bitrate
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    Quote Originally Posted by Cris
    How can it not have an ATX connector?
    http://www.mp3car.com/store/product_...ea82123f86d415

  7. #7
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    1 3.3V Orange +3.3 VDC
    2 3.3V Orange +3.3 VDC
    3 COM Black Ground
    4 5V Red +5 VDC
    5 COM Black Ground
    6 5V Red +5 VDC
    7 COM Black Ground
    8 PWR_OK Gray Power Ok (+5V & +3.3V is ok)
    9 5VSB Purple +5 VDC Standby Voltage (max 10mA)
    10 12V Yellow +12 VDC
    11 3.3V Orange +3.3 VDC
    12 -12V Blue -12 VDC
    13 COM Black Ground
    14 /PS_ON Green Power Supply On (active low)
    15 COM Black Ground
    16 COM Black Ground
    17 COM Black Ground
    18 -5V White -5 VDC
    19 5V Red +5 VDC
    20 5V Red +5 VDC

    Pinout of the ATX connector.

    The only thing I see a problem with is the 3.3V. Now, theoretically, couldn't I just drop in a resistor or a voltage regulator to drop down a 5V line to a 3.3V line?

    At the highest power consumption, the board takes 2.7A on the 3.3V rail and 2.3A on the 5V rail. The PSU can deliver up to 8A on the 5V rail. So, if I'm using 5A for the Motherboard, that leaves 3A for the HD and one or two USB devices

    Sound alright?

  8. #8
    Constant Bitrate
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    Ack, they didnt even send me the right PSU. They sent me the 12V only model. I've emailed them to ask if they can just exchange it for a different model.

  9. #9
    Maximum Bitrate buurin's Avatar
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    Quote Originally Posted by Splinter
    The only thing I see a problem with is the 3.3V. Now, theoretically, couldn't I just drop in a resistor or a voltage regulator to drop down a 5V line to a 3.3V line?
    not a resistor. a voltage regulator maybe, but a 3.3 vreg may need like 6+ volts. also assuming you are talking about those little IC vregs i dont think they source very much current (1a or so)... none of this is fact, just my 1AM off the top of the head response.. but im pretty darn sure sticking in 2 resistors to make a voltage divider isnt going to cut it because as soon as you connect a load to your 3.3v source it is no longer a 3.3v source. i think you can add an opamp to a vdivider circuit and connect it in such a way that it maintains the 3.3v.. i forgot what that circuit looks like though.

    okay enough showing off my electrical expertise

    goodnight.

  10. #10
    Constant Bitrate
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    MP3Car is replacing it for me.

    Great guys, I wish more online computer stores were like them

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