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Type: Posts; User: McSteel

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    I didn't just mean transmission losses (which...

    I didn't just mean transmission losses (which should actually be a bit lower for HVDC), high-power DC voltage conversion is still more lossy through semiconductors than AC voltage via transformers,...
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    I don't think that was the actual issue at any...

    I don't think that was the actual issue at any point... DC power delivery is much more lossy than AC, that fact hasn't changed.
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    The skin effect depth depends on the effective...

    The skin effect depth depends on the effective surface area available to electrons. In a litz wire, due to the individual conductors' proximity, most of the additional surface area gained by...
  4. Thread: 400Hz

    by McSteel
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    513

    Wouldn't be happy at all - the spec calls for...

    Wouldn't be happy at all - the spec calls for 47-63 Hz for auto-range PSUs. Should fail to start outright, unless the protections and the primary controller aren't up to scratch.
  5. Or it could be there's an efficiency "sweet spot"...

    Or it could be there's an efficiency "sweet spot" temperature range for the bridges, which is at say 50°C, and having the bridges warm up one another means it will be reached sooner and the...
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    Leakage current is left as a footnote only for...

    Leakage current is left as a footnote only for datasheets on which it can affort to be a footnote because its importance is directly determined by the application.

    Mentioning medical power...
  7. Thread: JapCaps™

    by McSteel
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    2,490

    Taicon? Their XinFeng factory should still be in...

    Taicon? Their XinFeng factory should still be in use for higher performance/stricter tolerance series... There are also some lower-tier manufacturers who could, in theory, make something useful given...
  8. Thread: JapCaps™

    by McSteel
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    2,490

    Both is true. Some are also made in Taiwan. ...

    Both is true. Some are also made in Taiwan.

    Not everything is as clear-cut as you might expect or hope for... The most important factor for capacitor longevity and performance consistency across...
  9. Thread: Flux

    by McSteel
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    2,815

    The short shelf life is not a problem if you...

    The short shelf life is not a problem if you don't buy tons of the stuff that you won't make use of in time.

    As for the fumes... I kinda like the smell, whatever it actually is. It's definitely...
  10. Thread: Flux

    by McSteel
    Replies
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    2,815

    Agreed, Amtech 559-UV is probably the best one...

    Agreed, Amtech 559-UV is probably the best one out there... for lead-free stuff.

    For 60/40 Pb stuff, I prefer ammonium nitrate in petroleum jelly - the manufacturer is of no concern in that case.
  11. Sticky: http://www.jonnyguru.com/forums/attachment.php?att...

    http://www.jonnyguru.com/forums/attachment.php?attachmentid=3768
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    That covers the "clamp" and "reset", now we just...

    That covers the "clamp" and "reset", now we just need to add: "the transformer is non-gapped and only used in one directon, and there is a FET connected to one of the transformers outputs used in...
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    Yes, but the caps should reform to ~95% of their...

    Yes, but the caps should reform to ~95% of their actual "health" within the first couple of seconds, or straight up fail after 8 years.

    I'm sure you know, at least to some degree, that the...
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    A paradigm shift and a perception change needs to...

    A paradigm shift and a perception change needs to happen in consumers first. Once people understand just how much power 450W is, perhaps then the industry and the reviews scrutinizing it will move...
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    And they can also be "repaired" (oiled and...

    And they can also be "repaired" (oiled and cleaned) fairly easily in most cases, restoring them to fully working order, so there's that too...
  16. Thread: resistor value

    by McSteel
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    6,105

    Yep, that one should definitely be 0.05 Ω ± 5%

    Yep, that one should definitely be 0.05 Ω ± 5%
  17. Thread: resistor value

    by McSteel
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    6,105

    That should be a 280 kΩ ± 1% Can't really...

    That should be a 280 kΩ ± 1%

    Can't really guarantee I'm correct, probably best if you wait for a couple more answers :)
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    The in-cable capacitors are added to increase...

    The in-cable capacitors are added to increase filtering performance without using limited PSU PCB available space. They're of no major concern regarding the PSU's output performance; as even if some...
  19. Thread: Gigabyte psu?

    by McSteel
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    1,248

    Not interesting as in "run-of-the-mill group...

    Not interesting as in "run-of-the-mill group regulated PSU that used to be mainstream circa 2006".
    It won't burn down the house but it's not quite special in any way either. You can learn more about...
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    But it is indeed entirely a matter of semantics....

    But it is indeed entirely a matter of semantics. For most people, making a choice doesn't necessarily imply that the choice would be informed and properly weighed against their needs and available...
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    I find that a soldering iron also does quite...

    I find that a soldering iron also does quite nicely. As far as using electrical tape goes, it's just a quick (and dirty) fix tool, I never did see it as a viable long-term solution to anything.
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    The interesting takeaway of all this is not...

    The interesting takeaway of all this is not getting too held up by the actual connections, but going by what participates in the circuit and in what way.

    This video is on the popular science...
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    The primary is quick and robust enough that it...

    The primary is quick and robust enough that it can take the transient load gracefully. Perhaps there could be some instantaneous spikes left unchecked but nothing too serious; I expect the overall...
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    Huh... A needless new low for Seasonic. I guess...

    Huh... A needless new low for Seasonic. I guess the SIs are the target, but...

    https://i.imgur.com/HDKyDio.jpg
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    I have. Well, not really in the way I wanted to...

    I have. Well, not really in the way I wanted to (was forced to pass everything and praise whatever floats even the tiniest bit above the crap line), but at least I got through the whole process, from...
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