SMPSU for Mackie SRM1801 rails seem too high

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  • DrewPhillips
    SFX PSU - Need High Current on 3.3V & 5V Rails?
    by DrewPhillips
    I have an older system which was built in the Windows 7 era and which has developed, I suspect, a power supply problem. The system had the same problem, random crashes, a couple of years ago, which I subsequently remedied with a new power supply.

    The power supply which came with the machine is a no-name "Safe Power PE-300". It is SFX form factor and claims a high current capacity: +3.3V @ 22A and 5V @30A (the +12V rail claims a meager 16A). Problem is that SFX supplies (or even ATX supplies for that matter) having high current ratings on the 3.3V and 5V rails seem to be...
    02-18-2025, 01:03 PM
  • harp
    Low voltage very high current rails distribution
    by harp
    Low voltage very high current rail distribution

    I have some mains toroid transformer220v/12v, and thinking to add a few one-two turns fat coil in parallel, like in picture. Red are working windings, purple (top and bottom) is rails who connect all low voltage windings.

    Question is, how to connect that device to be as much more efficient in spot welder operation to distribute and pulls currents to all winding equaly, minimalize voltage drop?

    output on half E-F
    output on C-B
    connect A-B and C-D, output on A-F
    otherwise?...
    10-27-2023, 02:45 PM
  • skwarszczow
    Macbook Pro A2141 020-01700-A GPU Artifacts then no S5 rails
    by skwarszczow
    Hello everyone,

    This is my first post on the forum

    I recently purchased a MacBook A2141 from a colleague at work, which had issues with the dedicated GPU. The system occasionally displayed artifacts on the screen and sometimes experienced kernel panics related to the GPU. Interestingly, applying pressure to the VRAM module would temporarily resolve the artifact issues, which made me optimistic about the ease of repair.

    Board: 020-01700, Config: Intel i7, 512GB SSD, 16GB Ram.



    Before completing the purchase, we decided to erase...
    03-23-2025, 06:04 PM
  • SarcasticOP
    General question about MacBook power rails for repair.
    by SarcasticOP
    I am looking at an A2337 and found this for the order of power rails and what they do. Can this be confirmed before I dive into hunting down power rails that do not exist or are not neccisary?
    • PPBUS_G3H (12.6V-12.8V)
      • This is the main power rail that supplies power to the entire system. Check this rail first, as it must be present for other power rails to work.
    • PP3V42_G3H (3.42V)
      • This power rail is derived from PPBUS_G3H and is used to power the SMC (System Management Controller) and other essential circuits. It should be present if PPBUS_G3H is working correctly.
    • PPVRTC_G3H (3.3V)
      • This
    ...
    12-12-2024, 05:50 PM
  • sam_sam_sam
    Is there any high current pouch battery that are size 60mmX80mm maximum thickness 21mm for a battery operated tab welder
    by sam_sam_sam
    I have a battery operated tab welder and the battery does not have enough current for the battery tab welder because after about 30 welded it does not have the same current output it voltage has gone down by at least 0.500 volts or maybe a more than that

    I can fit 21700 battery cells in the enclosure it is very tight fit for four of them that are 35 amp high current capacity 35X4=140 high current output this should work a lot better than what is installed right now

    I tested the battery cells there are installed right now and they are testing good with no issues that I...
    02-04-2025, 08:08 PM
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