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Thread: 400$ computer

  1. #61
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    How do you make a remote shutdown controller?

  2. #62
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    Quote Originally Posted by EBFoxbat
    You can remove the 230watt power supply that comes with the case and put the OPUS in it's place. You then run +12v from the car's + battery terminal. ( You have you use the right gauge wire and fuses, but the OPUS manual explains this). You run the - from the OPUS to the ground of your car, usually the closest available ground someplace on your car's frame (under the trunk carpet) The OPUS has a pretty nice startup controller built in. You need to run a wire from your ignition status lead (usually yellow and someplace behind your stereo) to the IGN input on the OPUS. You can hardwire this and bypass the startup/shutdown controller by running regular +12v to the IGN lead. But that get's fancy and you're not quite there yet.

    Well i understand all the wiring since ive wired many subs and i used a relay to turn on and off my computer righ tnow, So thats not a problem.

    Quote Originally Posted by Scouse Monkey
    You can always power some other DC-DC supplies switched on my the M1 but that is getting messy and don't forget you can also power your screen off the opus which should ensure it lives a long and happy life in your car.
    Is there a problem with powering the screen driectly from battery? Right now i actually just spliced into the cig lighter because the wires were so close n i figured it was already fused so no point in wasting time.




    I have some questions. A friend of mine built his own computer and made his own case. he suggested i get this one processor that is 833 mhz but it is extremely cool and requires very low power. He doesnt even use a fan. I forgot what it is called and i will post the name as soon as i get a hold of him and ask what it is.

    If/When i buy an opus and wire it all up, do i need anythign else to power all my drives and everything? Im assuming the OPUS behaves like a regular powersupply except it has a shutdown/startup controller and it is DC-DC?

    That case seems like it would be a great buy for the price. No need forme to build my own case which would probably cost me at least $15 in materials if i can just get a already made one for double the price.

    Thanks again to Scouse, EBFoxbat and everyone else who has helped so far.

  3. #63
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    Quote Originally Posted by Slitha
    Is there a problem with powering the screen driectly from battery? Right now i actually just spliced into the cig lighter because the wires were so close n i figured it was already fused so no point in wasting time.
    From what i understand it may damage your screen if you run it on an unregulated supply for a long time. True the Xenarcs (is this what you have i forgot) can run on more then 12V but the ciggy lighter will be a very dirty power line and will be going up and down depending on engine speed, alternator load etc and will normall actually be 14V. The screen only uses about 8-10W and most people liek to run them off the nice clean 12V line on the opus. Also that way they turn off fully with the PC. I believe the problem is with the backlighting supply but i aint sure on that. Lilliputs definitely should not be wired direct up to the battery and the eggs are a bit **** so defiinitely wire these up to a regulaed supply like the opus. The Xenarcs are a bit more of a profesional product (as reflected in their highter price etc) and can take a wide voltage range but they are the most expensive single part of your system.

    As for the 800mhz board that sounds like an epia mini-ITX. these iwllr un nicely off a 90W supply with a couple of laptop drives and have in built audio and graphics and are pretty damn small. I have heard people grumble about 800mhz versions lately and most people now go for the 1000 or 1200 which go for £100 - £140 int he UK which is about the same than a more powerful
    micro ATX setup with better graphics that can do the native res for your screen. They are very popular though and can do DVD and GPS with ease (graphics have mpeg2 decoding to take the load off the cpu). Don't compare a 1ghz epia with a 1ghz pentium etc.

  4. #64
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    Quote Originally Posted by BigfootsMonk
    How do you make a remote shutdown controller?
    i presume you mean a stand-alone one. have a jolly good search and you should find a circuit on here somewhere.

  5. #65
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    Slitha read here for more info on the screen issue: powering xenarc 7"?

    this thread is on the front page as it is active at the moment.

  6. #66
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    Yeah you pretty much don't want to run the screen right on the battery. you're going to either run regulated 12v from the trunk to the screen, buy a 12v regulator just for the screen, or go the Epia tiny form factor and put the entire computer under the passengers seat. The Epia's don't really perform all that well but are enough for most of the stuff you'll do.

    You could run an epia board, a hard drive (not a newer 7200 RPM drive), your screen, and probabaly a CD/DVD drive off the new cheaper M1-ATX power supply.
    ,./(0)3

    '04 Canyon 4x4 pickup

    [---PC on hold----working on external fiberglass "tool" box---]

  7. #67
    Dev
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    Getting back to the motherboard and mobile chip discussion, I am very close to settling on the MSI K7N2GM2 ILSR as it has most of the features that i require (built in at a decent price).
    However I do want to confirm that it recognises mobile athlons correctly(or at least good enough to work correctly) and that all the usual over/underclocking features required are there.

    If anyone has this mb or can find out
    1. what the Vcore goes down to(min to max range if possible) as it is 1.35v for xp-m 2400+ and 1.45v for xp-m 2600+ (nearly sure bout these but I am open to correction!)
    Don't want to be stuck using a Vcore of about 1.5V when I only require 1.35V ( this would be counter preductive as then the chips would run over there normal wattage of 35 and 45 respectively)
    2. What other speed features can be set from the bios e.g fsb/multiplier etc.

    Please help 'cos i,ve been scouring the net for pics of the bios on this board to see what can be adjusted and if they will work with a mobile athlon (no joy yet)

    PS. If anyone sees a problem with this settup please post as I would prefer to know before I buy

  8. #68
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    Dev, I have downloaded the manual etc and it states that the board is designed for overlcocking however i can only see that the fsb is adjustable from the bios section. I don't know if contacting MSI but it may help (let me knwo if you get a response). There are other alternatives eg Biostar, Epoc, Chaintech and all have slightly different features eg Epox has dual VGA, MSI has SATA, firewire and an svideo header on the board i believe. If ther is not voltage and multiplier settings the only way it to use the wire mod. There is nice little interactive thingy that shows you what wire to put where and if you do a search on athlon wire mod you shoudl find it. It was posted by MatrixPC.

    Let me know how you get on as i will be moving to mobile athlon when i have a basic laptop setup running well.

  9. #69
    Dev
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    I will try to contact them but I wont hold my breath for the response
    I have downloaded every piece of info that I could see regarding this board inc the manual and I can only see vague info, not looking good!
    I am especially interested in this board because I would be willling to experiment with making a raid array from cf cards (using suitable ide->cf adapters) eg 512mb/1Gig each for a 2/4/8Gig virtual drive that has plenty of space for the programs that I want to run, has less power consumption, will probably boot very quickly(no spin-up), and it has no vibration issues.
    BTW I know this is a bit out there but i figure it might just work because I have read that a cf card is recognised as an ordinary ide device and therefore you should be able to make them work for a raid array.
    I was thinking of then getting a cheap 30/40Gig laptop HD just for media files.

    Do you know of any mATX boards with similar features(doesn't have to be raid enabled but need sound/video) that definately work with the mobile athlon i.e. can be under/overvolted and under/overclocked?

    If you hadn't guessed by now I have put alot of thought into this carputer setup and I finally have the funds to get the computer/opus combination and migrate from my laptop.

    SOME DAY I WILL FINISH THIS PROJECT!

  10. #70
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    Is the wire mod not just for normal athlons that are multplier locked.
    I Could very well be wrong on that but i do know that mobile athlons are unlocked for changing cpu speed to conserve battery in laptops.

    Badly need answers to these questions!

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