Testing AC on SMPS

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  • Steph.hen
    Bridge rectifier identification part number KPB305G
    by Steph.hen
    Hi all, a newby question about a bridge rectifier I'm trying to identify.

    I'm in the midst of reparing a battery charger in work which went pop, The bridge rectifier has shorted and took out a couple of other components. The rectifier in question has a part number KPB305G, and it looks like it's obsolete. Does any one know what I could replace it with?...
    08-29-2024, 09:52 AM
  • momaka
    Casing Power MPT-301 [PCB ATX9806b-p REV: A3]
    by momaka
    This one should make @Pentium4 smile (if he is still reading BCN forums) – I got a new old stock / open box Casing Power MPT-301 PSU on eBay for $4 total.


    Yes, it’s a very generic-looking box, but the manufacturer isn’t (at least not back in the days), which is…

    Macron Power Technology Co. LTD.

    Let’s look at the PSU itself.



    The shell/case also appears quite generic, like many “sold-with-the-PC-case” units. However, the shell is well-formed and has decent steel thickness. In terms of...
    06-02-2021, 10:05 PM
  • madan1
    Troubleshooting half-bridge smps
    by madan1
    Hello everyone, I'm trying to fix what seems to be a half-bridge smps.
    The switching controller is sg2525a, which I have replaced with a brand new sg3525a. The low and high mosfets are 1c27ac 6n50. The mosfet driver is IRS2301S.
    Both mosfets were tested outside circuit with a component tester and seem to be fine.
    With oscilloscope I see ~65khz switching signal on both low and high outputs of the controller, but on the output of the mosfet driver there is switchig signal only on the low output (flat line on the high output).
    So I guess the mosfet driver is faulty?
    ...
    01-23-2025, 06:05 AM
  • momaka
    KingWin ABT-650MM 650 Watt ATX PSU [PCB: SW8835REV:A]
    by momaka
    For today's thread, I have a KingWin ABT-650MM ATX PSU. Official web page with the PSU specs is still up and can be found here:
    http://www.rmac.kingwin.com/products.../abt_650MM.asp

    I just can't help it when I see a broken / for parts PSU on eBay that's listed for cheap and looks at least somewhat interesting. Well, OK, I won't lie – on the outside, this PSU looks anything but interesting. It's a plain gray box with colorful “spaghetti cables”.




    What mostly drew me into buying it is its 2x PCI-E power connectors...
    03-29-2022, 11:34 PM
  • bauto601
    KDM 480W PSU upgrade succes! (opinions?)
    by bauto601
    Back in 2020 i bought a (2nd hand) compact ATX psu to replace my current one. My PC case only fits very short ATX power supplies so i didn't really have the choice of buying a decent 80Plus unit. The current unit is a modded YoungYear unit that i made a thread about a while ago:
    A "nice" YoungYear unit? - Badcaps

    The "new" unit is a KDM-M6480 480W psu, the 480W number is a typical KDM bullshit claim of course, but the 24A rating on the 12V rail seemed reasonable and the "Active PFC" claim gave me a bit of hope that this was going to be decent-ish....
    12-26-2023, 03:05 PM
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