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Thread: motherboard grounding & psu doubts

  1. #1
    Raw Wave RoyN's Avatar
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    motherboard grounding & psu doubts

    sorry for cross-posting from the noob forum, but I'd guess it wasnt getting any views from the smart people....

    Hi,

    I am remanaging my old carpc now that I realized that the mobo itself isnt that big it was the "mini" tower that was huge...

    Anyways, The motherboard, does it need to be bolted onto metal for grounding purposes or something? or could I build a case out of plexiglass or acrylic or whatever and bolt it straight onto that, together with the HD, etc, everything isolated from eachother and from the outside by the case material?

    Also, this is a regular motherboard, it has that large connector with a BUNCH of wires from the PSU, which my reading has taught me is an ATX connector, correct? Anyways, what 12v powersupply would be ideal to power my carpc? Is the opus compatible with this large connector (like 2cm by 8cm or something roughly the length of a IDE connector, 2 times the width), or the carntix? However I read that the carnetix should be connected to another psu??? Basically I need (from what I read) a 12V automotive regulating power supply which will survive crank, ideally have a shutdown controller builtin or that I can add, and that connects straight to my motherboard and other devices. It is ah Athlon XP 1.3ghz, hard drive, cdrom, gps, touch, bluetooth, slim cdrom, IDE cdrom, 2 case fans (I might reduce this but in my tests with an inverter i've been having psu heat problems)...



    Thanks!

  2. #2
    Raw Wave Confused's Avatar
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    It shouldn't make too much difference as all the components will be grounded through a common component...the power supply! Well, in theory anyway However, for ease-of-mounting, if you're not going to be seeing the back side of the motherboard, I would take your (or any) old case, and cut out the motherboard mounting tray, and attach that to the plexi. You can cut this down to the size of the motherboard, and it gives you a nice, solid base, and will have all the motherboard mounts in the right place, which could be a PITA with plexi!

    I would go for the Opus. As you said, the Carnetix requires the use of another DC-DC power supply, and only provides 60/80 W of power, more than a "standard" PC would probably use. The Opus is 150W, and will power even a Pentium 4 (there are people running 2.8GHz P4's from an Opus!), so the list of components you've specified should work well

    The Opus is ATX, which is what your motherboard is

    One thing I would check is whether your PC goes into Standby well..ie does it keep anything powered in Standby? If not, then I would set it up to use Standby once you have the Opus, my CarPC resumes to playing music within about 5 seconds of the power supply coming back on!


    Garry
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  3. #3
    Raw Wave RoyN's Avatar
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    Amazing thats all I wanted to know!

    Hmm.. now if only the opus werent so expensive....

  4. #4
    Raw Wave Confused's Avatar
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    No problems

    The Opus only seems expensive until you think about the alternatives:

    Inverter = $50, standard PSU = $30
    Then you find that doesn't work...
    DC-DC PSU + ITPS = $100
    Then you find that's just as bad
    Then you buy an Opus = $200

    Total spent: $350

    Doing it right and just getting an Opus = $200

    You've just saved $150
    Co-Developer of A.I.M.E.E
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    Constant Bitrate HoSS's Avatar
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    Putting your PC in a plastic case is not a favourable EMC situation.
    It will work ok, but you will get emissions, which i could cause interference with other parts of the system.

    Apart from that the emmisions are illegal
    Did you know there is a big problem in the sattelite comms field (amoungst others) of improperly cased PC equipment. This radiates straight out to space & disrupts communications.
    If enough people have uncased or plastic cased PC's (the trend is rising) there will be signifiacnt EMC problems with sattelite coms in the future.
    Yes, NO TV!!!!

  6. #6
    Maximum Bitrate
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    Quote Originally Posted by HoSS
    Putting your PC in a plastic case is not a favourable EMC situation.
    It will work ok, but you will get emissions, which i could cause interference with other parts of the system.

    Apart from that the emmisions are illegal
    Did you know there is a big problem in the sattelite comms field (amoungst others) of improperly cased PC equipment. This radiates straight out to space & disrupts communications.
    If enough people have uncased or plastic cased PC's (the trend is rising) there will be signifiacnt EMC problems with sattelite coms in the future.
    Yes, NO TV!!!!
    Huhhhh....

    Okay.... thats sounds resonable.... not.....

  7. #7
    Raw Wave RoyN's Avatar
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    he he he I'm a spy..... My work involves using a modified computer to disrupt satelite communications!

  8. #8
    Constant Bitrate
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    Quote Originally Posted by HoSS
    Putting your PC in a plastic case is not a favourable EMC situation.
    It will work ok, but you will get emissions, which i could cause interference with other parts of the system.

    Apart from that the emmisions are illegal
    Did you know there is a big problem in the sattelite comms field (amoungst others) of improperly cased PC equipment. This radiates straight out to space & disrupts communications.
    If enough people have uncased or plastic cased PC's (the trend is rising) there will be signifiacnt EMC problems with sattelite coms in the future.
    Yes, NO TV!!!!
    You expect us to believe you when you can't even spell satellite?

  9. #9
    Raw Wave Confused's Avatar
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    Quote Originally Posted by HoSS
    Putting your PC in a plastic case is not a favourable EMC situation.
    It will work ok, but you will get emissions, which i could cause interference with other parts of the system.

    Apart from that the emmisions are illegal
    Did you know there is a big problem in the sattelite comms field (amoungst others) of improperly cased PC equipment. This radiates straight out to space & disrupts communications.
    If enough people have uncased or plastic cased PC's (the trend is rising) there will be signifiacnt EMC problems with sattelite coms in the future.
    Yes, NO TV!!!!
    Do you really think that's a problem with a CarPC.

    What is surrounding the PC? Oh yeah, a car. What's a car made of? Metal. There you go, that's your EMC shielding.


    Didn't think that through too well, did you?
    Co-Developer of A.I.M.E.E
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  10. #10
    Constant Bitrate HoSS's Avatar
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    Quote Originally Posted by Confused
    Do you really think that's a problem with a CarPC.

    What is surrounding the PC? Oh yeah, a car. What's a car made of? Metal. There you go, that's your EMC shielding.
    Didn't think that through too well, did you?
    You clearly don't understand much about RF.
    How big are your car's windows? What is the maximum gap required to attenuate a 1Mhz siganal (2mm).

    It was a serious post.
    My work brings me into contact with the ESA (European space agency) people, I have been to a lectures on just this problem.

    look here: http://www.edn.com/article/CA81915.html

    The point is this - you can take some responisblity for what you are doing, or you can live in your kiddy world where you don't understand or it doesnt matter to you....

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