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Type: Posts; User: ashiekh

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  1. I feel sure this is not the reason.

    I feel sure this is not the reason.
  2. Who is going to measure? a little thought might...

    Who is going to measure? a little thought might have avoided this.
  3. I am for always on (but temperature responsive)...

    I am for always on (but temperature responsive) as kicking in can be more annoying than humming along quietly.
  4. Why don't the bridge rectifiers straddle their...

    Why don't the bridge rectifiers straddle their heatsink?
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    Windows 10 version 1909 is trying to change that...

    Windows 10 version 1909 is trying to change that trend
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    Having a spare power supply around is always...

    Having a spare power supply around is always useful, if only for diagnostics.
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    Rest assured that the Guru knows, and that I am...

    Rest assured that the Guru knows, and that I am just behind the times.
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    I would have said the secondary capacitors and...

    I would have said the secondary capacitors and fan, and left out the switching transistors; but that is just me. I tend to rebuild old supplies with top grade secondary capacitors and oil the fan to...
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    It might even be argue that the switching for LLC...

    It might even be argue that the switching for LLC is much gentler on the transistors than for older designs.

    Take for example a traditional household switch, it will in general switch randomly on...
  10. Good to know; I think I'll just leave the bust...

    Good to know; I think I'll just leave the bust video cards be.
  11. Max transient temperature for an electrolytic capacitor

    Many electrolytic capacitors can operate at 105C, but some people reflow a whole board which means taking it up to around 230C; how safe is this for the capacitors?

    I have a whole lot of video...
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    As I understand it, leakage current for a new (or...

    As I understand it, leakage current for a new (or long unused) electrolytic starts off large as the dielectric reforms, then reduces.

    But it is good to have it confirmed that one does not need to...
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    That is why I put the word ground in "Now for...

    That is why I put the word ground in

    "Now for medical grade power supplies leakage to ground is an issue."

    do I know what I am taking about? I thinketh not.
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    One adds a bleed resistor across the primary...

    One adds a bleed resistor across the primary capacitor for safety, i.e. one has greatly increased the leakage current intentionally; so I would argue that in the context of a power supply leakage...
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    Have you ever read a power supply review that was...

    Have you ever read a power supply review that was concerned about leakage current in the capacitors? if not, then since they don't worry, maybe you don't need to.

    Says he nervously in anticipation...
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    The capacitors I replace are for smoothing, not...

    The capacitors I replace are for smoothing, not precision; I assumed the original poster was referring to such large electrolytics.

    After capacity, voltage, temperature rating and physical size I...
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    When I replace secondary capacitors it is one...

    When I replace secondary capacitors it is one thing that I don't worry about.
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    Fascinating, I learned something new; hadn't...

    Fascinating, I learned something new; hadn't thought of the resonating issue.
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    Are all fans 'gradual'

    I recall a cooling fan decades ago that had speed modes, and the jump up in speed and back down I found very distracting. I assume all power supply fans these days are now run on a gradual curve?
    ...
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    'equally good' because it has 'better...

    'equally good' because it has 'better performance'

    seems to me a bit of a contradiction
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    Silicone oil might help reduce contact resistance.

    Silicone oil might help reduce contact resistance.
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    I think conflicting advice is normal when the...

    I think conflicting advice is normal when the requirements are not well defined

    You want

    * reliable
    * silent
    * efficient
    ?

    the list goes on; each may lead to a different recommendation.
  23. Thread: dc-dc psu

    by ashiekh
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    364

    I used to live in Trieste, Italy and Slovenia was...

    I used to live in Trieste, Italy and Slovenia was one of my favorite places to visit for the mountains and caves.
  24. Thread: dc-dc psu

    by ashiekh
    Replies
    11
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    364

    Why so complicated? mains to 12V to ATX and only...

    Why so complicated? mains to 12V to ATX and only 60W on the 12V line.

    A PC based router might take 50W which will cost a lot in electricity, so a stand alone unit might save money.
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    You pull the plug when it is in sleep mode?

    You pull the plug when it is in sleep mode?
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