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Oscillator

Discussion in 'Electronic Design' started by Jim Thompson, Mar 29, 2006.

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  1. Jim Thompson

    Jim Thompson Guest

    In some prior posts there have been inquiries regarding low distortion
    oscillators.

    Out of curiosity I simulated a 200Hz oscillator made simply from an
    A1A-style gyrator BP filter, then wrapped a positive feedback loop
    around it, with back-to-back diodes used to limit the drive to the
    input to the BP filter.

    Result: 3rd harmonic was at -58dB

    ...Jim Thompson
     
  2. John Fields

    John Fields Guest

     
  3. Jim Thompson

    Jim Thompson Guest

    I'll post it in a few minutes.

    Just got back from the hospital where my youngest son (33 years old)
    is being treated for colon cancer that has spread to lungs and liver
    :-(

    ...Jim Thompson
     
  4. Jim Thompson

    Jim Thompson Guest

    See...

    Newsgroups: alt.binaries.schematics.electronic
    Subject: Oscillator Schematic (from S.E.D) -
    GyratorFilter_A1A_Oscillator.pdf
    Message-ID: <>

    ...Jim Thompson
     
  5. Ban

    Ban Guest

    Jim, I am with you and your wife in this hard time.
     
  6. Seconded. Life can be a right bugger sometimes.
     
  7. Guest

    Bummer. I'm of an age where too damn many of my friends are starting to
    die of cancer. The fact that it strikes pretty much at random is no
    comfort at all.
     
  8. John Fields

    John Fields Guest

     
  9. Jim Thompson wrote...
    Aw shit! :-(
     
  10. That is terrible. I hope his doctors are generously with painkillers.
    Today I returned from a 5-day trip to Cairo with my brother, who has
    lung cancer. A totally insane trip to see the Pyramids, but we did it.
    Spend time with your son, Jim.
     
  11. Jim Thompson

    Jim Thompson Guest

    Thanks to all of you for your comforting words!

    They put a STENT in Duane's colon and laser-ablated the tumor there.

    So they haven't cut into him yet.

    They're installing a "port" in his chest this morning for ease of
    doing the chemo.

    The doctors seem very upbeat, but I saw the pictures... doesn't look
    good to me :-(

    ...Jim Thompson
     

  12. I lost my mother to Colon cancer when she was 52. Its a nasty
    disease, but there have been some advancement in treatment in the last
    20 years.

    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  13. I'm very sorry, Jim. I sincerely wish you the best in this.

    Jon

    P.S.
    It's not the same thing, but my 21yr old autistic daughter has grand
    mal seizures (a few weeks ago, three separated by four hours in a
    single day) and has broken six of her teeth on the bathtub a few years
    ago and broke both her ulna and radius just last September. Helping
    her through a seizure and discovering a broken arm or bloody teeth on
    the floor is something I hope few parents experience.
     
  14. Chuck Harris

    Chuck Harris Guest

    I lost my dad to colo/rectal cancer early last year. He was 76.

    I started my EE career developing electronic controllers used in cancer
    treatment (1981), I was quite immersed in the field back then. I quit
    working in medical electronics largely because of the draconian regulations
    the FDA put into place in the mid '80s... (done largely because a Canadian
    company that made radiation treatment equipment cocked up, and cooked a
    few patients beyond crispy, but sadly, I digress...)

    When my dad was diagnosed back in '02, I started to re-acquaint myself with
    the state of the art in colon cancer treatment, and I was simply appalled!

    They have made great strides in palliative measures (ease the symptoms),
    but absolutely *no* progress in curing the disease. The measures that
    are called "cures" are really just extended remissions. In very rare
    circumstances, they have patients that are actually cured, but in most
    cases, the disease re-emerges within 5-7 years. That counts as a cure
    because the patient lasted 5 years past the diagnosis. In spite of that,
    I believe the medical community is on the threshold of a cure.

    The radiation treatments that they use are most concerning. The treatments
    literally kill the colon and the surrounding pelvic tissues, bones, and bone
    marrow. The patient becomes extremely susceptible to broken pelvic bones,
    and perforated intestines. The maximum expected lifetime of a patient that
    has had these treatments is around 7 years. By that time, the colon is in
    shreds. No surgeries can be performed after these treatments because of the
    inability of the exposed tissues to repair themselves. That may be appropriate
    for a 70yo man, but not, I think, for a 33yo man.

    Understand that your son's chances of survival are well less than 10%. His
    youth is his best asset in beating these odds.

    There are a few treatments that have been shown to have good results on the
    liver involvement. His liver is what will ultimately kill your son, so do
    not ignore this! If the lesions in his liver are still small, and few, there
    are a couple of things that can help. The University of Maryland is doing
    some treatments called RF Ablation (which oddly enough I helped develop
    while I was still doing my graduate studies) which allow for a minimally
    invasive method of killing a few localized tumors. They also are using a
    process called SIRT spheres, which can kill off great quantities of small
    tumors, provided the liver is still functioning. *TIME IS OF THE ESSENCE!*
    And there is also a technique that involves injecting a lethal dose of
    a chemo agent directly into the blood supply of the liver, which has shown
    some good results. These treatments are all FDA approved, and are on
    the insurance company's lists of approved treatments. Don't let the doctor
    tell you otherwise!

    One other thing, the success rate of the experimental treatments being done
    by NIH is well above what his doctor will tell you. He will say it is about
    6%, but the truth is some are more like 60%. Look into the programs that are
    being done by NIH.

    If by some chance your son "crashes" when he is getting an herbatux treatment,
    it is because the drug, as administered, doesn't match the electrolyte levels
    needed to keep his heart beating. Have his doctor send all of his stats, and
    other information to IMCLONE. (We made a big mistake here with my dad.)

    Google is your friend. You can easily find the programs I have mentioned
    by using google. If you can't, let me know, and I will look up the urls.

    -Chuck Harris
     
  15. Jim Thompson

    Jim Thompson Guest

    Thanks, Chuck.

    I'll look into your references.

    My son is at Banner Baywood which is recognized as a specialty cancer
    center... a stroke of luck because that's the emergency room he walked
    into when he started losing blood rectally.

    ...Jim Thompson
     
  16. Jim Thompson

    Jim Thompson Guest

    I believe my autistic grandson is 13 (I lose track of birth dates what
    with 6 grandkids :)

    Haven't seen any indications of a tendency toward seizures.

    For the past year he's been at a new school which seems to have found
    his hot button... except for still no speech, he's becoming remarkably
    adapted to normal living.

    ...Jim Thompson
     
  17. In our case, it didn't start until she was 14 years old. I was told
    by a neurologist that it is common to take place only after the onset
    of puberty and very rare, beforehand. I'm told it does happen more in
    females, as a percent, but I personally know one profound autistic
    male who also has regular grand mal seizures.

    That sounds reasonably positive. Our daughter still has her need of
    continuing support and she still causes me problems (she recently
    turned on a soldering iron and burned a ribbon cable for a DSP board;
    twisted a fiber optic cable I needed into a tight pretzel; and just
    generally cannot resist the temptations to 'help' me work; etc.) But
    we're getting along pretty well and she has such a funny sense of
    humor in her drawings. I do get a kick out of her being around. So I
    give and get. What hurts me is wondering each night if I'll wake to
    something worse than I've already experienced. Probably inevitable,
    given time.

    Jon
     

  18. My mother had uterine cancer over 10 years earlier. After a year of
    radiation and chemotherapy treatments for the colon cancer she went into
    remission for 11 months. Then it came back with a vengeance. It
    quickly spread to her circulatory system, and then to her brain. She was
    dead a couple weeks after it became active, again. I don't wish her
    suffering on anyone. They didn't give her enough pain killers, even
    though they knew that she was dying.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  19. My prayers will be with you as well!

    Charlie
     
  20. Jim Thompson

    Jim Thompson Guest

    Thank you, Charlie!

    ...Jim Thompson
     
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