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A relatively unimportant announcement...

Discussion in 'Electronic Design' started by Paul Burridge, Dec 24, 2003.

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  1. I'm off to the pub.
  2. Trying to outdo Genome? You've got some work ahead of you...
  3. I just got back about 20 minutes ago. Still no sensible answer to my
    question about the fsd.... :-(
  4. James Meyer

    James Meyer Guest

    You are only doing an ac simulation of the circuit and you're only
    measuring the RF voltage across the meter. RF is not going to drive the meter.
    Only DC will make the meter pointer move.

    Do a transient simulation of the circuit and look at the end conditions
    after the circuit has been running for several seconds.

    If the answer to your problem doesn't jump out at you, let me know and
    I'll walk you through it.

  5. Rich Grise

    Rich Grise Guest

    Heck, I can outdo that. I brought the pub home with me.

  6. Jim Thompson

    Jim Thompson Guest

  7. My Christmas has got back on track again. Jim,
    I'm grateful to you for your interest in this circuit, but your
    representation of it on this page is quite frankly baffling. I invite
    anyone without anything better to do this Xmas (like Jim and I, by the
    look of it) to compare my schematic with Jim's representation of it
    and spot the differences...
  8. Jim Thompson

    Jim Thompson Guest

    Sheeesh! One does presume you wanted a DC current in your meter, thus
    the added capacitor, C2, across the meter.

    The added diode makes it work... take note of the comments... D2 OUT =
    your circuit, NOT FUNCTIONING, D2 IN, it works.

    ...Jim Thompson
  9. Jim Thompson

    Jim Thompson Guest

  10. Jim Thompson

    Jim Thompson Guest

    Have you performed a TRANSIENT simulation in LTSpice?

    I find it hard to believe that Mikey's transient response would give
    incorrect results... unless the "quicky" diode model doesn't do well
    at 40MHz.

    ...Jim Thompson
  11. Yes sir. I even run one 'til my hard disk filled up with the pS-by-pS
    record of it and the whole computer came to a grinding halt.
    Just remember, if my circuit works in practice, I own your ass. :)
  12. Jim Thompson

    Jim Thompson Guest

    What's the definition of "works"?

    ...Jim Thompson
  13. James Meyer

    James Meyer Guest

    Paul's posting on his web site shows that the *did* do a transient run.
    For all of 10 nanoseconds!

  14. Jim Thompson

    Jim Thompson Guest

    Aha! I guess I should have paid closer attention. My simulation ran
    for 25us with 1ns steps.

    Paul is certainly in for a surprise ;-)

    ...Jim Thompson
  15. Jim Thompson

    Jim Thompson Guest


    Somehow I missed Paul's simulation and can't find reference to it in
    the thread. Do you have the URL?

    It's puzzling that he ran for so short a time. The PSpice sim only
    took 6 seconds.

    ...Jim Thompson
  16. Jem Berkes

    Jem Berkes Guest

    I'm off to the pub.

    Our night started at the local watering hole, then ended with joyous rides
    on plastic saucers pulled over fresh snow behind a VW Golf at 40 km/h.

    Ahh, the holidays! :D
  17. You guys are in for your own surprise. | got up to 15mS today before
    the computer crashed. I'm gonna own *both* yo' asses (as you say in
    the US according to all the movies I've seen). :)
  18. Jim Thompson

    Jim Thompson Guest

    Ah, yes, movies! SO REPRESENTATIVE of how things really are here in
    the good ol' U.S. of A ;-)

    25us (that's MICRO-seconds) will do quite nicely. Please post the sim
    results... maybe I can snag Mikey at the same time ;-)

    ...Jim Thompson
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