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Thread: Power Supply

  1. #1
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    Sep 1999
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    Norman, OK, USA
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    Power Supply

    I have almost everything I need to build my system. But I still have to make a decision on the power supply. From what I have heard, power inverters are to choose as the last option: problems with sound, DC to AC then AC to DC, space, ... I still haven't haven't found a DC-DC converter for ATX motherboards, even the pricey one from mp3ondemand.com is only for AT boards. I have heard that I just need to add a 3.3V (I guess)on that, but I don't know anything about it.
    I have seen industrial power supplies with 8-16VDC on the net. Some people mentioned it on the board, but it looks like nobody use it. Here are some URLs. What are does? Would it be easy to install?
    http://www.arisecomputer.com/ps/html/powersply.htm
    http://www.icpacquire.com.tw/ace870a.htm

    What do you guys advice me to do (for my power supply)?
    Thanks

    Bachir

  2. #2
    sj
    sj is offline
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    irving
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    DC/DC is certainly only way to go.
    There is several comercial AT style 12VDC input power suplies available at reasonable price, as those you showed in your mail.
    ATX is not so easy case but you can find those also, example is http://www.casedepot.com/products/ps/dc_ss/dc.htm
    Its 250W at $145.
    AT power suplies are about half price of that.
    sj

  3. #3
    Variable Bitrate
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    Jul 1999
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    West palm Beach , Fl, USA
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    291
    Even though my inverter was free( on loan from a friend ) it still gives off alot of noise, and its also inefficient. It creats a larger strain on the battery as well (so Im told) I would go with DC-DC

  4. #4
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    145$ ?!!!!
    well I don't think that I'll need more than 100W-120W...
    Is there anybody out there who could tell me how to modify an AT power supply to make it work with an ATX motheboard?
    Thanks Guys! It's great to be able to count on a community like this one :O).

    Bachir

  5. #5
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    Chesapeake,VA,USA
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    Ok. I am very new to the electrical side of computers. I don't even know the difference between amps, volts and watts. What do I really need to operate a computer, a Sharp 6 inch display w/ backlight, and how would I hook it to the battery? I know an inverter is one option, so how many volts or watts or whatever does it need to be? If I don't go with the inverter, what specificly is my best bet? (Please be a simple as possible) Thanks alot in advance!

  6. #6
    Constant Bitrate
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    Sep 1999
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    Charlotte, MI, USA
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    Bakassi -

    Can't help ya. Check Ebay for REALLY cheap inverters. I didnt even know certain inverters only work on certain types of motherboards. I thought that as long as it could cover the wattage it was good.

    CaptainBeast -

    An inverter is something that takes the small 12v produced by your cigarette lighter or other power source and turns it into a ****load of wattage so it can power yer 'puter. "simplicity"

    - JustAGuy

  7. #7
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    Chihuahua
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    there might be a diagram on the net to convert the 12v to the different voltz that need the motherboard , if someone know one plz tell me , thankz

  8. #8
    Low Bitrate
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    Brisbane, Australia
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    In response to sj saying that the DC-DC is the ONLY way to go:

    In the beginning, I thought "Yeah, DC-DC sounds the best way to go.. it'd be heaps efficient".. but now I'm a firm believer in DC-AC inverters.. they are cheap as ****, you don't have to mess with the computers power supply.. so if you wanna whack the computer out of the car and run it in the house or something you can.. and inverters are pretty efficient.. maybe you'll loose a little bit of power as heat.. but not much.. they are really quite good..

  9. #9
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    Jul 1999
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    Fort Washington, MD
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    I agree with inmytree...i'm running TWO inverters (hardwired) and I don't have any power problems. One is 140 watts and powers a VCR, the other is 300 Watts and powers the computer and a playstation. It's a lot more convenient to pull the box out and plug it in at my desk to mess around with the interface and playlists than using a DC DC power supply (although you could just buy a AC-DC convertor from Radio Shack)
    pics of my install are at http://stormworks.max3d.com/mega300/
    for anyone interested (mp3car website soon)

  10. #10
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    Sep 1999
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    I'm using an switch mode power supply chip from Maplins. It is a Maxim device that is capable of taking 12Volts input and supplying 5Volts output. It generates little heat, no noise and even has thermal overload protection, short-circuit protection, warm start etc..

    I am building and designing the board myself. I also have a 12V supply from a TIP122 darlington pair and a diode. It only needs to supply 600milliamps.

    The +5 volt line needs only 3.6 Amps and these include the HDD and my circuits for the LCD etc.

    If you are not going to use the serial ports, then you don't need to worry about connecting the -5V and -12V lines which means less complexity.

    Maxim chips are 7 quid so good price.


    I will hopefully have details and a PCB if anyone is interested on my new website, when completed.

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