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Thread: My weekend project...

  1. #1
    FLAC evandude's Avatar
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    My new DC-DC (weekend project)

    I thought I'd share my little weekend project.



    I just got it finished and tried it out, using a 12V DC motor as the test load (I don't have any good power resistors around, unfortunately)
    But it worked! I am running an epia 800 mobo with a laptop drive and CDROM, so my total current draw was under 2 amps last time I checked. Supposedly this design will put out 8 amps or so, obviously I haven't tried pushing my luck yet. When I get a chance, I am going to get some beefy load resistors, heatsink the transistor and diode, and give it a more thorough stress test to see what it's capable of.

    The best part is, the total cost of parts was about $20. $15 at digikey (caps, inductors, diode, transistors) plus about $5 for the core for the main coils (magnet wire for those was a freebie) Once I can really test it, I will etch a board for it to get it off the ugly perf-board.

    You can also check it out on my website, where I'll probably try keeping updated info as I test it and such, http://www.eegeek.net/mp3box/ (click on "power" in the menu)

  2. #2
    Low Bitrate
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    Nice
    Da_Kooz

  3. #3
    FLAC evandude's Avatar
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    Thanks. I just got done hooking up a 6.4 ohm, 50 watt resistor to it at 12v output... that's a 22 watt load. I'm working my way up to higher loads, making sure nothing blows up along the way.

  4. #4
    Constant Bitrate blackbravo's Avatar
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    hang on newb question alert
    this regulates the cars power supply so it can provide power to a MOBO
    yah? opus style???
    and its cheap
    or am i gettin my hopes up?
    Still Planning and Scavenging Parts ------Software-----and anything else i can lay my hands on!!! :)

    Acquired a Toshiba Satelite 4000CDT
    HDD`s ****ed new one on way! 30gb Toshiba.

  5. #5
    FLAC evandude's Avatar
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    well, it only provides 12v output, so it's like the 80 watt 12 volt model Opus... I use a PW-200-M to get the rest of the voltages. But, those are $90 so this is a whole lot cheaper. I also tested it today with an 85 watt load and it did half decent. I need to add actual heat sinks before i can say how stable it is at 85 watts.

  6. #6
    Self proclaimed spoon feeder TruckinMP3's Avatar
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    Sweet... Tell us more ...
    TruckinMP3
    D201GLY2, DC-DC power, 3.5 inch SATA

    Yes, you should search... and Yes, It has been covered before!

    Read the FAQ!

  7. #7
    FLAC evandude's Avatar
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    Well I'm a college student and the semester is wrapping up... which means I hardly have time to eat sometimes... but when it finally ends in about a week I'm going to etch up a PCB and see what kind of performance I get out of a more "polished" model. Would any of you be interested in PCB's? (or parts kits, or assembled models, if there's interest I can order some more parts...) I hadn't exactly intended on selling them, like everyone I was looking for a cheap alternative to spending $90+ on an opus

  8. #8
    FLAC evandude's Avatar
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    Oh, and I also do a lot with microcontrollers so needless to say, the design will probably be gaining a shutdown controller very soon (either integrated or separate...) Since it's what I want for my setup, the shutdown controller will probably include a "turbo timer" type of setup whereby I can set a timer before I shut the car off, so that I can leave it running for... say 15 mins while I run in to the store... and not have to boot the comp back up again when I come back.

  9. #9
    Constant Bitrate blackbravo's Avatar
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    yeah i`ll be game for a part kit or full blown, if it works out cheaper than opus
    but i am in uk so postage to think about
    but YEAh
    Still Planning and Scavenging Parts ------Software-----and anything else i can lay my hands on!!! :)

    Acquired a Toshiba Satelite 4000CDT
    HDD`s ****ed new one on way! 30gb Toshiba.

  10. #10
    FLAC evandude's Avatar
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    I can guarantee it'd be less than an opus (I would make a KILLING selling them at $90 apiece... lol)

    My converter consists of a whole lot fewer parts than the opus. I would also guess that the efficiency isn't as high, but then again with the average stereo system consuming hundreds of watts, the difference between requiring 110 watts and requiring 90 watts to output 80 watts is really just a drop in a bucket for a car electrical system... The only real difference then will be heat, which also shouldn't be a huge concern, since if you were really worried about it you could spend the money and get an opus...

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