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Type: Posts; User: Per Hansson

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  1. Replies
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    The black band is not part of the color code, it...

    The black band is not part of the color code, it is just there to tell you which side is the end.
    This is why it's also printed at the very end of the resistor...
    So I would say 0.14ohm 2%

    As...
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    Why not buy another PSU that actually fits for...

    Why not buy another PSU that actually fits for the same 100 you are buying cables for?
    Then sell the current PSU locally?
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    Yes. ...

    Yes.

    https://en.wikipedia.org/wiki/Measurement_category
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    I stand by what I have written in my previous...

    I stand by what I have written in my previous post and see no reason to change any recommendations within.
    A standard oscilloscope is designed for CAT-I environments, the primary side of a PSU is a...
  5. Thanks Paul for a very interesting recap! This...

    Thanks Paul for a very interesting recap!
    This goes to show that if you get a PSU with quality capacitors you don't need to *drumroll* recap ;)

    Actually I'd wager a guess that the small reduction...
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    It's not safe. Show me a general scope with...

    It's not safe.
    Show me a general scope with anything but a CAT-I rating.
    You are measuring a circuit connected to mains here.
    The scope needs at the very minimum a CAT-II rating for such...
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    "but a feature that trips the GFCI seems a little...

    "but a feature that trips the GFCI seems a little strange to me."
    It's not meant as a feature: it is just a side-effect of how it works.
    And as long as you know what you are doing and don't probe...
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    For the love of god just read the damn Fluke...

    For the love of god just read the damn Fluke page: https://www.fluke.com/en-us/learn/blog/digital-multimeters/dual-impedance-digital-multimeters
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    Obviously the low input impedance has a function,...

    Obviously the low input impedance has a function, which if you had cared to read the Fluke post I linked you would understand.
    Or if you would have read my messages you would have understood it too,...
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    As I already explained in the earlier quotes...

    As I already explained in the earlier quotes above the Schuko plug that is very common in Europe can be reversed.
    It's also worth mentioning that it is pretty common that the monkeys that wire up...
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    Isn't the TX650 v2 DC-DC for 3.3v and 5v? Looks...

    Isn't the TX650 v2 DC-DC for 3.3v and 5v?
    Looks so when you see the output specs at least.
    If so I'd say it's ok for modern builds.
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    First an advisory before you read this post:...

    First an advisory before you read this post: NEVER EVER plug an oscilloscope up to a switch mode power supply unless you REALLY know what you are doing.
    You WILL short out the power supply because...
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    You seem to really love splitting hairs! So it's...

    You seem to really love splitting hairs!
    So it's not ok for me to say "almost always" when that is my experience?
    I tested a Seasonic S12-II 430w revision A1 PSU today:
    140VAC and (high frequency...
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    This is completely wrong and actually dangerous...

    This is completely wrong and actually dangerous information on a forum like this.
    Primary side heatsinks are almost always live!

    More info on this if you want to learn:...
  15. There have been many UPS discussions on here...

    There have been many UPS discussions on here before, I think this FAQ is quite pertinent though.
    It saves me the trouble of writing what has already been written before ;)...
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    I'm not sure I understand what you mean, there is...

    I'm not sure I understand what you mean, there is no power "sloshing around"
    The meter gives an incorrect reading, that is all.
    Rephrasing myself from my earlier linked post on Badcaps what I said...
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    Please read the following two posts by me and it...

    Please read the following two posts by me and it will be clear:
    https://www.badcaps.net/forum/showpost.php?p=593720&postcount=2424
    https://www.badcaps.net/forum/showpost.php?p=594448&postcount=2444...
  18. Replacing the capacitors is not enough, you need...

    Replacing the capacitors is not enough, you need to super glue the transistor together too else it wont work.
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    No we are not, you have completely destroyed the...

    No we are not, you have completely destroyed the original.
    Why hack it together when the correct product it available?
    This is mains we are talking about, not a 12v battery charger.
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    There should be a model designation somewhere,...

    There should be a model designation somewhere, remove the yellow tape on it.
    Here is the correct category:
    ...
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    I would use the Antec TP750, it's a solid PSU,...

    I would use the Antec TP750, it's a solid PSU, would just open it up to blow the dust out and check that it looks ok (no bloating caps or dead animals etc)
    But as JG says that is also a quite...
  22. It's a bit of both, when they "just" bloat it's...

    It's a bit of both, when they "just" bloat it's usually due to overvoltage.
    I have seen that on reputable brands too...

    But the worse failure is in brands like Capxon, Ltec etc etc, they just...
  23. It's very simple to imagine: The old PSU's...

    It's very simple to imagine: The old PSU's without PFC use just a voltage doubler circuit.
    The frequency the capacitor sees will be line frequency times two (since we use a full wave bridge...
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    Generally dual fans can be good, especially when...

    Generally dual fans can be good, especially when positioned at the exhaust side of the PSU.
    But that limits you to 80mm fans and thus they noise goes up significantly.
    Enermax also used to have...
  25. Pictures of the aged unit undressed would be...

    Pictures of the aged unit undressed would be nice, hint hint ;)
    Also would be cool, if you're anyway going to scrap them, to check the ESR & capacitance of the caps.
    Especially the primary side...
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