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Thread: DC-DC device ?

  1. #11
    Variable Bitrate
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    I think I finally found out what you meant with this alcas stuff. Is this it: http://schapenstal.homeip.net/alcas/...tional%20cards ?

    Although it looks like he uses the PS to power everything (MB & devices), I'm not very certain. Email him & ask about it.

    It seems to be a pretty good PS if it really does what he says it can do. Find postings of people that have built that PS. Email them and ask for opinions if necessary.

  2. #12
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    hcker2000 > no I don't have a link

    edikp > sorry, I thought that ALCAS was better known sorry for my unclearness.
    Any idea on how I can get the negative lines ? (-5 and -12V )
    Or do I just have to switch the polarization ?

  3. #13
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    Quote Originally Posted by headtrip
    edikp > sorry, I thought that ALCAS was better known sorry for my unclearness.
    Any idea on how I can get the negative lines ? (-5 and -12V )
    Or do I just have to switch the polarization ?
    Well, the fact that I didn't know about it doesn't make ALCAS not popular. No apology accepted.

    I don't really understand your question. Negative lines? If you were asking about how would bring power to motherboard then get an ATX power extension cable (look @ attached image). Providing u hv a mobo with ATX power connection, of course.
    Attached Images Attached Images  

  4. #14
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    No

    An AT connector has pins with:

    +12 volt
    +5 volt
    -5 volt
    -12 volt

    my question was, how to get those negative voltages. Can I just reverse the polarization ?

  5. #15
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    How would you reverse it? The negative voltages need to be generated. Folks kinda talked about it here: Smallest way to get -5v

    Btw, are you just trying to save money on power supply by using an alternative? Rather than worrying for alternatives, buy an already built one. Mini-box.com has several that are relatively cheap (about $35). Or browse the For Sale section of this forum. Or eBay. Or..?

  6. #16
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    my question was, how to get those negative voltages. Can I just reverse the polarization ?
    No, you will have to use some type of converter to change the polarity. Most newer Motherboards do not require these additional voltages. You might be able to get by without them on older systems, if you do not need a mouse or pointing device. If you attempt to reverse the polarity on these lines, you will surely smoke your motherboard. The type of system you are describing takes a fair amount of power supply knowledge to construct. Unless you are fairly versed in switchmode power supplies, you might want to stick with an inverter and normal power supply.

    Just my opinions though
    Walt
    http://www.safossils.com/mp3car.html

  7. #17
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    Ah, there you go. Back to basic. Regular power supply & inverter. Thank you, waltsongs.

  8. #18
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    Get an opus
    -Jesus- King of Kings Lord of Lords

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