electromagnetic field therapy

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  • caspian
    What Zener Diodes on a Linear Power Supply
    by caspian
    Dear members,

    I have a linear variable power supply with unknown brand name that I used for voltage injection.
    Then it failed. I discovered that its transistors (Q1 and Q2) are shorted.
    In addition, I discovered that its zener diodes are defective.
    I can replace the burned transistors.
    But I do not know the model of the zener diodes. the model number is not marked on the zener diodes.
    Therefore, I cannot replace the zener diodes.
    I do not want to test the zener diodes in a test circuit to discover their model or value.
    no schematics are available...
    05-26-2025, 12:38 PM
  • Document Archive
    ALIENWARE Steam Machine R2 i7-6700T Specification for Upgrade or Repair
    by Document Archive
    This specification for the ALIENWARE Steam Machine R2 can be useful for upgrading or repairing a desktop PC that is not working. As a community we are working through our specifications to add valuable data like the Steam Machine R2 boardview and Steam Machine R2 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
    09-12-2024, 03:28 PM
  • CG2
    Janome DC3050 Sewing Machine Pedal Resistance
    by CG2
    OK, this is a long shot. I got this sewing machine cheap because it's end of line, ex-display, and had no pedal. The genuine pedal costs £60, while Ebay knock-offs go for around £15. So I went for the knock-off, it doesn't work, and I'm not sure whether it's the pedal or the sewing machine that has the problem.

    Now this is an electronic machine, unlike the old fashioned sort where the pedal was a big resistor in series with the power to the motor. Here, the pedal is just (I think) a variable resistor fed with a 5 volt supply, and limited to a current of 5 milliamps. Assuming that...
    04-14-2023, 07:53 AM
  • Soulzink
    Samsug washing machine. Power supply DC41-00189a board issue
    by Soulzink
    Hi everyone,

    I am trying to fix a samsung washinmachine power supply main board.
    I already replaced it with another one to fix the machine but i want to try understand the issue with the old board.
    Therefore i hope to be able to get some help to explain what to check in order to troubleshoot.
    The power supply board reference is the following: DC41-00189a
    I have followed one thread (https://www.badcaps.net/forum/troubl...ingmachine-rel...
    04-19-2025, 06:26 AM
  • nev1001
    What zener diode might fix the sound on Maestro Mayhem gaming chair?
    by nev1001
    Hi, I'm looking for a bit of help trying to fix the audio unit from a Maestro Mayhem 4.1 gaming chair please.

    The chair has a few speakers and vibration motors. All was well, for a while, but now the sound is gone.

    It may be significant that I discovered my son was powering it with a 19V laptop charger when it should run on 12V - it did fully work, for bit.

    I think an issue could be a zener diode (or capacitor) which has shorted out.

    The board's bluetooth input still works, the vibration motors are working, so is the line out socket but not the...
    04-17-2025, 05:09 PM
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