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    #1

    StarGT 250W AT

    Found this old computer free on the side of the road. This thing has all the cheapest off brand manufacturer stuff on it. Soyo motherboard with Mteq chipset, unknown manufacturer sound card, unknown manufacturer modem, S3 video card, O.K. Data ram, and it had this power supply in it. About the most gutless wonder I have ever seen in my life. The UL number leads to Real Power enterprises. Tiniest transformer I have ever seen. But what is the purpose of that second smaller transformer?



    Almost no input filter except for a coil and 2 tiny y caps. Input caps are 220uf 200v Capex brand.



    The primary switchers are 2 sanyo 2sc4161's, 400v, 7A, 14A pulse.



    Secondary heatsink. The 5v is regulated by that 30A, 45v schottky you see there, while the 12v is handled by 2 FR30's, good for 3A each. The 12v on this is rated at 10A.

    Secondary filtering is taken care of by capex and some CEC international's.



    Daewoo dbl494

    I don't think there is any protections what-so-ever on this thing.
    Attached Files
    Last edited by 370forlife; 11-02-2009, 02:39 PM.
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    #2
    Re: StarGT 250W AT

    the smaller transformer is for base drive to the choppers.
    and yes thats about as gutless as you can get in an at.

    Comment

      #3
      Re: StarGT 250W AT

      The smaller transformer is for current sensing too.
      I have seen the "Capex" brand of electrolytic capacitor in a cheap small B&W TV and radio - any more information on this capacitor brand?
      My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.

      Comment

        #4
        Re: StarGT 250W AT

        Its not such a bad power supply ......... it doesn't have a two transistor "fire hazzard" 5vsb circuit.
        Last edited by everell; 11-03-2009, 07:03 PM.
        Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

        Comment

          #5
          Re: StarGT 250W AT

          I think it might just use some salvaged parts and caps to make this a little better. One big step up will be replacing the transformer with the old 33 transformer from my yuelin. Replace those two diodes with something like a 20A, 45v schottky from a sunpro, some X and Y caps laying around, 4A, 400v bridge rectifier, maybe some 470uf primaries and replace the secondaries. Use it to bring my old biostar-quantex board back to life.

          Comment

            #6
            Re: StarGT 250W AT

            everell; lol, indeed
            We have here found the indestructible 5VSB circuit!
            "The one who says it cannot be done should never interrupt the one who is doing it."

            Comment

              #7
              Re: StarGT 250W AT

              The 12v is low because the only thing that would use it was the drives back then. Pretty much everything else ran off your 5v and 3.3
              Ludicrous gibs!

              Comment

                #8
                Re: StarGT 250W AT

                Originally posted by everell
                Its not such a bad power supply ......... it doesn't have a two transistor "fire hazzard" 5vsb circuit.
                I've agree with that.
                | AMD Phenom II X2 550BE | GIGABYTE GA-MA790FXT-UD5P | GeIL DDR3 Ultra 2x2GB 1600C7 |
                | XFX GTS250 DDR3 512MB | Dell H525EF-00 | Lancool PC-K62 Black | Samsung 2232GW |
                | 2xWD7500AYYS | 2xHD322GJ Raid0 |

                Comment

                  #9
                  Re: StarGT 250W AT

                  Originally posted by everell
                  Its not such a bad power supply ......... it doesn't have a two transistor "fire hazzard" 5vsb circuit.
                  and thats all you can say for it... what a POS!

                  the worst i've seen is this LSI at thing rated for 235w, but it has no guts, no filter, 4 diodes, tiny finless heatsinks, poor ventalation, thin wire, just plain old s***ty. it was a hell of a lot worse than your gutless wonder... sometime i'll post pics of my LSI so you all can lose your lunch.
                  sigpic

                  (Insert witty quote here)

                  Comment

                    #10
                    Re: StarGT 250W AT

                    I am curious as to what you were referring to "your gutless wonder". Hopefully you weren't talking about my Bestec ATX-250 12E with 5vsb circuit converted to DM311 chip and dual fans for less heat generation and improved cooling. I think my Bestec is now a classic!

                    As for the StarGT 250 watt AT, it does come up on the "lacking" side, especially the 5vsb circuit.
                    Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

                    Comment

                      #11
                      Re: StarGT 250W AT

                      i meant the psu in this thread... starGT 250w AT
                      sigpic

                      (Insert witty quote here)

                      Comment

                        #12
                        Re: StarGT 250W AT

                        Its name implies it's an AT power supply, rather than ATX

                        I thought AT power supplies didn't need a 5VSB circuit, because they used a mechanical On/Off switch
                        better to keep quiet and be thought a fool, than to open your mouth and remove all doubt

                        Comment

                          #13
                          Re: StarGT 250W AT

                          Yeah that's right, AT only has +/- 12v and +/- 5v outputs. The power switch is hard wired to the input AC line. When an AT computer is off, there as no electricity (except transients from discharging caps) flowing anywhere.

                          Comment

                            #14
                            Re: StarGT 250W AT

                            That's right. AT power supplies do not have a 5vsb circuit. That's why it doesn't have a "killer" two transistor 5vsb circuit. That was the only redeeming value I saw in this power supply!
                            Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

                            Comment

                              #15
                              Re: StarGT 250W AT

                              Originally posted by dood
                              The 12v is low because the only thing that would use it was the drives back then. Pretty much everything else ran off your 5v and 3.3
                              Well, 6A of diodes for the 10A rated 12v rail doesn't seem right to me.

                              Comment

                                #16
                                Re: StarGT 250W AT

                                pfrcom; you are very correct
                                Sometimes our humor and or sarcasm on this site might be a bit hard to understand
                                "The one who says it cannot be done should never interrupt the one who is doing it."

                                Comment

                                  #17
                                  Re: StarGT 250W AT

                                  Thanks for letting me down gently Per Hansson - I didn't realise I'd stumbled into the middle of a bulldust swapping session
                                  better to keep quiet and be thought a fool, than to open your mouth and remove all doubt

                                  Comment

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