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Whoo! Got Presslab's DC-DC convertor working!

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  • Whoo! Got Presslab's DC-DC convertor working!

    It took about 8 hours of work, but I finished it!

    This was just an experiment on an old AT power supply. I'll order a tiny micro atx supply, mod that one, too, and have a working DC-DC supply for my car!

    Many, many thanks to Presslab!

    Here's some pics, I'll do a full writeup with lots of pictures and instructions when I get home from work tonight.

    http://mp3box.2y.net/ps/00.jpg
    http://mp3box.2y.net/ps/01.jpg
    http://mp3box.2y.net/ps/02.jpg
    http://mp3box.2y.net/ps/03.jpg
    http://mp3box.2y.net/ps/04.jpg
    http://mp3box.2y.net/ps/05.jpg

    [ 12-21-2001: Message edited by: Arby ]
    www.arbybean.com

  • #2
    http://www.mp3car.com/cgi-bin/ultima...c&f=9&t=000121

    Here's the original thread about it...
    www.arbybean.com

    Comment


    • #3
      will some one post direction on how to make this stuff....I want to see if i create my own
      I mean, if Arby could create one, I see no reason why i can't create one myself

      [ 12-21-2001: Message edited by: Charles Enwesi ]
      abcd-1
      Author of CobraI,II,III and now CobraIV.
      You can contact me on AOL instant messenger....nick is cenwesi or cenwesi3

      Comment


      • #4
        Way to go Presslab n Arby!!!
        Just one question, what is the V input range the modified PSU can handle??
        04 Acura TL w/ core2duo 2ghz laptop w/ 1gb RAM on a docking station.

        Fast car, fast PC. ;)

        http://www.arcdesigns.net/carpc/

        My TL CarPC ver2

        FSR Flash Skin w/ moving weather maps

        Comment


        • #5
          Hey arby,

          was just wondering, 8hours of work? Allthough I've taken quite a long time, I don't think I've spend more then 1-2 hours soldering & rewinding? Have to say that I'm still not sure if mine will work ok, had a problem with the two 540's getting way to hot, presslab gave me some hints, did the adjustments just didn't get to testing yet.
          It's great to hear someone else has got it working. Who ever thought you could modify your old broken (I blew up the AC part some time ago, when the fan stopped working) ATX to a workind dc-dc psu for +/- $10 !!

          moahdib,
          If I rememerber correct presslab talked about a low of 6,5V dunno for sure, have to read the old topic.

          Marcel

          [ 12-21-2001: Message edited by: marsjell ]
          If at first you don't succeed.........
          destroy all evidence you tried

          for info on t6369c LCD or Presslab's powersupply check:
          http://www.namms.tk <=updated!!

          Comment


          • #6
            I have this wierd atx psu... it has 3 seperate small transformers, instead of one large one. I was wondering if it is possible to do presslab psu mod on this psu, or does it have to be the single transformer type?
            My Setup

            Comment


            • #7
              Originally posted by Arby:
              <STRONG>It took about 8 hours of work, but I finished it!

              </STRONG>

              Looking good Arby, congrats! It took me a better part of a day too, but it was worth it!

              Presslab

              Comment


              • #8
                Originally posted by Mike Hunt 79:
                <STRONG>I have this wierd atx psu... it has 3 seperate small transformers, instead of one large one. I was wondering if it is possible to do presslab psu mod on this psu, or does it have to be the single transformer type? </STRONG>
                Mike,

                You probably can do my power supply mod to it. One transformer will be the main one, the next will be the +5V standby one, and the last might be a filter on the output, or possibly a feedback transformer. If you post pictures of it I can probably tell if it can work.

                Presslab

                Comment


                • #9
                  Originally posted by marsjell:
                  <STRONG>Hey arby,

                  was just wondering, 8hours of work? Allthough I've taken quite a long time, I don't think I've spend more then 1-2 hours soldering & rewinding? Have to say that I'm still not sure if mine will work ok, had a problem with the two 540's getting way to hot, presslab gave me some hints, did the adjustments just didn't get to testing yet.
                  It's great to hear someone else has got it working. Who ever thought you could modify your old broken (I blew up the AC part some time ago, when the fan stopped working) ATX to a workind dc-dc psu for +/- $10 !!

                  moahdib,
                  If I rememerber correct presslab talked about a low of 6,5V dunno for sure, have to read the old topic.

                  Marcel

                  [ 12-21-2001: Message edited by: marsjell ]</STRONG>
                  Marcel,

                  Let me know if you need any more help, you're almost there.

                  Presslab

                  Comment


                  • #10
                    arby or presslab,

                    could one of you do me a favour and measure the voltage on the +12V & +5V output? mine are +26V and +8V, presslab said too try and connect an old HD or something and measure again, but I'm scared I'll blow up the hd, I don't have anything old that I can attach..

                    thanx,

                    Marsjell
                    If at first you don't succeed.........
                    destroy all evidence you tried

                    for info on t6369c LCD or Presslab's powersupply check:
                    http://www.namms.tk <=updated!!

                    Comment


                    • #11
                      Originally posted by moahdib:
                      <STRONG>Way to go Presslab n Arby!!!
                      Just one question, what is the V input range the modified PSU can handle??</STRONG>
                      moahdib,

                      The transformer is designed to work down to 6.5V. The PWM IC has a undervoltage lockout at 8V. So, the supply with work down to 8.3V continuous, with a dip to 6.5V for a second or so sustaining output. Ideally it would be better to use a different PWM chip, but I haven't found a better one yet.

                      Presslab

                      Comment


                      • #12
                        Originally posted by marsjell:
                        <STRONG>arby or presslab,

                        could one of you do me a favour and measure the voltage on the +12V & +5V output? mine are +26V and +8V, presslab said too try and connect an old HD or something and measure again, but I'm scared I'll blow up the hd, I don't have anything old that I can attach..

                        thanx,

                        Marsjell</STRONG>
                        Well, I know my supply has 5.1V on the +5 and 11.8V on the +12. If you don't have any type of load to spare, then you'll have to use resistors. For the +12 use a 10 watt 18 ohm (or so) resistor. A 10 watt automotive bulb would work here too. For the +5 use a 10 watt 3 ohm (or so) resistor. These should load the supply enough to get a stable voltage out.

                        Presslab

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                        • #13
                          The pictures and detailed instructions are coming... I work retail, so I've been having some crazy hours lately
                          www.arbybean.com

                          Comment


                          • #14
                            How hot does your transformer get under load?

                            What is the input/output efficiency?

                            Comment


                            • #15
                              Wow, information is so hard to find in this fordward transformer thread. (both threads).

                              Just to let the non-electronic engineers get some info, I THINK this is what people are doing:

                              convert the 12V DC into AC current. I'm purely guessing that this is done via the "PWM" (Pulse Width Modulation) chip (SG3525AP?). Once in AC form, a transformer will work to step up/down voltage. The custom made transformer is used to step 12v AC to about 6 or 7 volts, and 4 volts to then be converted back to DC, and "regulated" down to 5 and 3.3 (and converted back to DC). I'm guessing the 12v is obtained directly from the input, and tossed into a regulator of some flavor to make it a "nice" 12v.

                              the transformer itself is the easy part.

                              [ 12-26-2001: Message edited by: JoeShmo ]

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