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power factor correction circuits wanted

Discussion in 'Electronic Design' started by Razor's Edge, Jul 12, 2003.

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  1. Fred Bloggs

    Fred Bloggs Guest


    Please view in a fixed-width font such as
    Courier.



    UGLY HEAD

    ________
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  2. Fred Bloggs

    Fred Bloggs Guest

    Please view in a fixed-width font such as Courier.



    UGLY HEADS OUT TO GET JOHN FIELDS

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  3. Bill Sloman

    Bill Sloman Guest

    It isn't the first swipe I've taken at you on this subject, and was as
    much prompted by the OP's response to your unhelpful heckling as by
    your recent eruption. Unlike you, I'm not in the habit of responding
    to threads where I can't give useful input, so the necessity to add an
    apology rarely arises.

    Don't bother to tell me that you don't find any of my posts useful -
    that is a problem with the receiver, not the transmitter.
     
  4. Bill Sloman

    Bill Sloman Guest

    If you could restrict yourself to volunteering when you could help,
    we'd all be most grateful. Since this would - in part - depend on you
    learning to value you talents as the rest of the world does, I'm not
    holding my breath.
    That is one possible reaction. Another would be to realise that I'm
    not the only one who finds that you add more noise than signal to the
    debate.
     
  5. Razor's Edge

    Razor's Edge Guest

    John,

    You could always try to email it directly to me, don't know where my
    mailserver says stop...

    Otherwise, a P2P program could do the job.

    --- Stefan
     
  6. John Fields

    John Fields Guest

     
  7. John Fields

    John Fields Guest

    ---
    Really?

    Remember this one?:

    "John, if you are going to re-invent the wheel, try and re-invent the
    wheel rather than the lumpy log roller.

    The linear variable differential transformer is the logical
    development of this idea, and it works quite well. Futzing around with
    a movable core in coil was a nice idea back whenever they first tried
    it, but it is of strictly historical interest in this context. Were
    you planning on using a spark gap as the active component in your
    oscillator, to add to the period feel?"

    Hardly what I would call useful input, since it's both inaccurate,
    vituperative, and denigrating. (Yes, _both_ ;-) I mean, Bill, how
    could you have been so stupid? You tout yourself as being an
    intelligent man who pays attention to detail, and yet you neglected to
    take a simple trip to Google to check the facts before you inserted your
    big foot into your even bigger mouth. Haste makes waste, no?, and you
    just _had_ to launch that barb.

    No apology required, Bill, the silence following my previous rebuff was
    reward enough. Thanks a lot, I'm going to chuckle about that one for
    quite a while!
    ---
    ---
    No, Bill. Even the most exquisitely sensitive receiver can't
    differentiate between signal and noise if there's no coherent signal
    present.

    I do, however, find your posts eminently useful as models of a writing
    style and an attitude which celebrates self-indulgence and passé
    expertise.
     
  8. Razor's Edge

    Razor's Edge Guest

    Thanks for the PFC information everyone!
    Seems to be very useful stuff.

    Regards
    Stefan
     
  9. Bill Sloman

    Bill Sloman Guest

    If you say so, John, but you haven't exactly made a case.
    Your opinion on what is stupid *should* be that of an expert, but I'm
    afraid that you classify everything that you can't understand as
    "stupid", so the catagory is a little too all-inclusive to be useful.
    Enjoy your innocent pleasures - one of the many comforts of
    self-delusion.

    True, but irrelevant. There are other receivers out there, you know.
    Nice line. Where did you poach it from?
     
  10. Bill Sloman

    Bill Sloman Guest

    You may "know" that I fell down, but the point I made was valid - if
    you want to measure displacement with any sort of accuracy with an
    inductive sensor, you use a linear variable transformer because it is
    reasonably linear and the symmetrical structure is less susceptible to
    a variety of errors.

    You can measure the inductance of a single coil as a function of
    position of a moving core of high(ish) permeability material, and if
    you aren't interested in an accurate measurement - much beyond
    distinguishing between a gap and the absence of a gap - this will work
    fine. Making the inductor the inductance in an LC tank circuit is
    similarly fine if you aren't interested in accuracy.

    If you are interested in accuracy you've unnecessarily added the
    instability in the capacitance to the instabilities in the inductance
    you are measuring.

    The OP clearly wasn't interested in the sort of crude measurements of
    displacement where your antique approach might be good enough.

    This is pretty much what I posted on at 2003-07-12 16:12:14 PST on the
    "Re: Cheap displacement transducer" thread, but it bounced off your
    imbecilic self-satisfaction then, and it will bounce off again now.

    You may think that I "tripped myself up", but your response just
    illustrates that you don't have a clue about what is involved in
    making stable and reproducible displacement measurements in the real
    world.

    I'm quite sure that you bin every input that reflects on your grasp of
    modern electronics - your ego clearly hasn't taken the pummelling it
    deserves.

    The case was made, John. You failed to understand it.
     
  11. John Fields

    John Fields Guest

    ---
    I agree that the LVDT _may_ be the sensor of choice, but it's not what
    the OP asked for, as attested to by fact that you offered your
    capacitive displacement sensor as an alternative.
    ---
    ---
    Got some numbers?
    ---

    ---
    Usually, the only "instability" will be the tempco of the cap as well as
    that of the coil, and that problem was solved decades ago by using a
    capacitor with a tempco adequate to minimize the effects of temperature
    on the oscillator.
    ---
    ---
    Got some numbers?
    ---

    ---
    Just because _you_ post it doesn't make it dogma, no matter where or how
    often you post it. If you want to convince me, Let's see something
    like a plot of resonant frequency VS core position for a tank with a
    reasonable Q, say 100?
    ---
    ---
    My response was tailored to the application and I really don't see why
    you're having such a problem with it unless you're grasping at straws
    trying to keep from having to admit that you made a mistake.
    ---

    ---
    Disagree with The Sloman and get thrown into the bin reserved for them
    what makes him feel uncomfortable?

    In the first place your premise is flawed, and in the second you don't
    have the resources required to carry out your fantasy.
    ---
     
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