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Thread: DSX12V: 12V in 12V out 10 AMPS!

  1. #91
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    May 2005
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    41
    What kind of system are you running?

    Glad it's working for you!

    -Jeff
    What are your PC Specs? Details!
    Alright, here are the detailed specs on the CarPC I've put together:

    Motherboard: Taken from the Shuttle ST62KS. This motherboard is very unique as it has a 6pin port on the back for 12v input. Makes it very car friendly. I bought mine refurbished for about $160. Take a look here. It supports P4 478pin, up to 800 FSB, onboard ATI Video, dual channel memory, etc etc. I bought it just for this CarPC. This unit also came with a hefty (10A+) 120v->12V Converter which I have some dirty plans for ;]

    Case: Custom built from plexiglass and sweat (and blisters) Still need to deal with cooling in my case, but I've got plenty of ideas. Cold cathode for some added bling. Depending on final power draw, I would like to add a second CC.

    HDD: 120G 7200RPM Maxtor from pile of stuff. Will probably switch to 5400RPM before finalizing install.

    CPU: P4 2.8/800 Northwood. Underclocked to 1.86Ghz to reduce heat (plus I don't need the extra speed right now). Undervolted to 1.25v for the same reasons.

    Memory: 1G DDR466 clocked @ 333. 2x512 Sticks of Kingmax BGA ram, undervolted to 2.5v. Might drop back to 512 if heat or power is an issue later. Using 128MB for video ram (overkill? sure, but heh, I don't need 994MB for and MP3 player either ;] )

    Screen: Xenarc 700TSV, not yet running from regulated 12v power (plan to do this eventually). Very nice screen, good touchscreen, overall very happy with it.

    I've also hooked up my XM Direct (Serial + 12v), Holux USB GM212, USB2 Hub(unpowered), Wireless USB Keyboard, USB Touchscreen. I am using the micro shutdown controller from mp3car.com, which I believe Jeff also designed (correct me if I'm wrong). This piece is also working very well.

    I've tested the power supply with all this hooked up, and it survives engine crank no problem. My only issue so far is with the motherboard. Despite my best efforts with powerstrip, I cannot get the onboard video to display a native 800x480 resolution. I've put this to the back burner for now, but I hope to one day get it figured out (worst case, I'll get a low profile pci nvidia card)

    For software I am currently using Frodoplayer w/Frodosatelliteradiox and iGuidance 2.1, with hibernation working fine. I've also got streets and trips installed for the POI database which it has.


    Future plans include a USB wireless nic(want to find one with good range) and trying to get a dvd player into the setup somewhere. Adding a second cold cathode. I also want to power the Xenarc from this power supply so that when the computer is off, so is the Xenarc, instead of wasting power scanning for a signal. Oh, and I also need actually finish the install ;]

    Here are a few pics to see what I've got setup. I didn't take a picture with my meter inline to measure amps, but it maxed out around 8 (on the input side of the DSX12V). I'll take more detailed measurements once everything is installed.

    Thanks again,
    Scott
    Attached Images Attached Images      

  2. #92
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    Last night I changed my power setup so that the Xenarc LCD runs off the DSX12V as well. Everything still seems to work well.

  3. #93
    FLAC
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    Apr 2001
    Location
    Portland OR
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    1,244
    Quote Originally Posted by foltster
    Last night I changed my power setup so that the Xenarc LCD runs off the DSX12V as well. Everything still seems to work well.
    Just make sure the DSX12V doesn't get too hot. You should still be able to touch it. If it is getting too hot, take a small fan (hack an old CPU fan or something) and place it so it blows air over the middle of the DSX12V. It is >95% efficient so at 8 amps, that is only about 5 watts of heat spread out over the PCB. The components are rated with junction temps up to 150 degrees C.
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  4. #94
    FLAC
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    Portland OR
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    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  5. #95
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    Just make sure the DSX12V doesn't get too hot. You should still be able to touch it. If it is getting too hot, take a small fan (hack an old CPU fan or something) and place it so it blows air over the middle of the DSX12V. It is >95% efficient so at 8 amps, that is only about 5 watts of heat spread out over the PCB. The components are rated with junction temps up to 150 degrees C.
    I'm running at just over 5 amps when things settle down after booting. It spikes to about 8.5 during POST, but not for more than a few seconds.


    Quote Originally Posted by zootjeff

    I've been watching the heat. It is "warm" to the touch, Id guess around 60c, but certainly not hot. When I install the DSK12V it into its own little plexiglass case, there will be a fan to move air through the case. I have a box of fans from other computer and projects, so I'm sure I can find one that will do the trick.

    Thanks,
    Scott

  6. #96
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    soon as the price gets down to that $50 ill buy one soon as you announce that

  7. #97
    FLAC
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    Apr 2001
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    Portland OR
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    Webpage Updated

    You can find info about the DSX12V on my website now

    http://www.mpegbox.com/products.html
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  8. #98
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    Jul 2003
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    I have read the whole thread and viewed the pdfs....but im stupid so im going to ask a question!

    How do i power an atx motherboard with this? I dont see anything i can connect to a atx power socket on my mainboard.

    Im prepared to be flamed

    Thanks!

  9. #99
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    Quote Originally Posted by Blop
    I have read the whole thread and viewed the pdfs....but im stupid so im going to ask a question!

    How do i power an atx motherboard with this? I dont see anything i can connect to a atx power socket on my mainboard.

    Im prepared to be flamed

    Thanks!
    Generally speaking you don't. (Somebody correct me if I'm wrong)

    Personally I am using a board which only needs 12V to operate (Shuttle ST62K), which makes this ideal for providing the power I need.

    Scott

  10. #100
    Variable Bitrate
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    Apr 2004
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    228
    It was me who posted to the newsgroup about this product.

    A year ago when I was highly interested in a 12V car supply there was no single IC non transformer based option that could get to this power level easily. I was going to do one with the hobbyist in mind but the part count and complexity was a bit too much. An LM3488 running in SEPIC configuration could get close to this power level given about $20 in low esr capacitors, and even then board layout would have been super critical due to high switching currents.

    Other options were dual controller buck/boost boost/linear setups which to me just weren't elegant enough and the last option would have been a dedicated SMPS supply and I just didn't want to go that route either due to higher part count and having to mess with transformers (not always easy for a hobbyist).

    I knew eventually a vendor would probably develope a single IC solution, and here we are.

    You have a nice supply there, really nice. You should have trusted me (not an easy thing to do though) when I said I was just curious. Now someone who is even more up to terms on these things went and exposed your supply. Why don't you offer a full psu? High power on the 5V line is 'trivial' and I am sure tons of people would be happy with just the supply and not all the shutdown features and extras the opus provides.

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