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Latest EDN

Discussion in 'Electronic Design' started by Spehro Pefhany, Sep 14, 2004.

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  1. Latest (September 2) issue, both my copies, have an extra
    whatchamcallit (signature?) of pages- so pages 50 to 64 appear twice.

    That's good luck for the advertisers in that section- they get double
    the exposure (and probably more than 100% better return). Such as the
    makers of that cool delay/pulse generator on page 60.

    Best regards,
    Spehro Pefhany
  2. Fred Bloggs

    Fred Bloggs Guest

    OH PLEASE- don't tell's Highland Technology-haha.
  3. John Larkin

    John Larkin Guest

    The hardest part was composing the HELP system, complete with toc and
    hyperjumps, to run on a 20-character display. Some serious synonym
    searching was required! It felt like writing

  4. I hate doing multi-level menus using a 4-digit 7-segment display...
    I'd have hoped 20x4 real characters would not be confining.

    Best regards,
    Spehro Pefhany
  5. John Larkin

    John Larkin Guest

    I've considered writing poetry, or maybe a short story, that would be
    readable on a 7-segment display. K, V, X, and W are nasty, and M is

  6. I read in that John Larkin <[email protected]> wrote (in <[email protected]>) about 'Latest EDN', on Mon, 13 Sep 2004:
    Just choose your words carefully! It's not too difficult to avoid K V X
    and W unless you are writing about radio stations!
  7. Ban

    Ban Guest

    Exept the V these letters are not used in Italian, and the V can be replaced
    by U anyway, as some other discussion has shown, so write in Italian.
    Mr. Woodgate could help you with the translation.
    BTW Mr. Woodgate, autumn is coming here, but still 22°C at night. :)
  8. Night-time temperatures here are fluctuating wildly, according to
    whether there is cloud cover and when it occurs.

    Hot = clear skies until about 1600, then full cloud cover developing and
    remaining till 0600.

    Cold = full cloud cover until 1600, then clear skies until 0600.
  9. Dave VanHorn

    Dave VanHorn Guest

    Night-time temperatures here are fluctuating wildly, according to
    Sure. Clouds block the longwave IR from escaping to space.
    Clear nights are always colder.
  10. Robert Baer

    Robert Baer Guest

    Concerning the Sept 2 EDN, page 55 longwinded article on digital
    common noise, why in the heck didn't anyone just fix the totem pole
    driver circuitry to achieve virtually zero spike current during
    At Fairchild, back in the 1980s era, IBM was complaining of timing
    errors created by scads of totem pole drivers switching all at the same
    time (wide parallel bus, differential output - making for double the
    The spike current was in many amp region at room temperature, and with
    a very stiff +5V supply, could exceed 100 amps at 85C.
    Good thing the problem was moved from the digital group to the analog
    The pseudo long-tailed pair that was used to convert the single-ended
    input to a differential signal was the first poorly designed section.
    The threshold was not temperature compensated correctly, a low value
    resistor was used for the common emitters, and the small gain difference
    between the two transistors was nor compensated.
    We made it a "perfect" long-tailed pair by using a current source for
    the emitters (just like in an op-amp) and fixed the reference design as
    well; and used the correct collector resistor imbalance to achieve equal
    and opposite signals (in the linear region).
    Having equal and opposite signals fixed the timing error in the
    And the drivers for the output totem pole needed some improvement,
    along with some added circuitry to rapidly remove stored charge in the
    base of the pull-down during turnoff.
    As i vaguely remember it, that spike current was reduced to about an
    amp at 125C, and almost zero at 25C.
    In the original driver, spikes created during 0-1 transitions happened
    at a different time than spikes created during the 1-0 transitions;
    making for a *very* noisy supply.
    Naturally, with 32 sets banging away, the supply had spikes that went
    negative a substantial amount, and far too positive (7V can destroy a
    lot of TTL devices).
    Not to mention the masking / skewing of other data signals...

    Too bad there is no way for me to get this feedback to the EDN author
    (i found it impossible to get anywhere on the EDN site - even by
    stooping to IE).
  11. legg

    legg Guest

    You're assuming that the readers cover the contents more carefully
    than the publisher's proof-reader.

    I was disillusioned, somewhat, in high school, to be pointing out to
    the librarian that whole sections of new paperbacks were repeated or
    missing. I was the sixth or seventh borrower, in the days when readers
    actually signed their names on the checkout slip. Previous 'readers'
    were some of the schools 'brightest and best'. I found it hard to take
    them or the institution seriously, afterwards.

    Mind you, 'Eyeless in Gaza' and the like, could be considered a bit of
    a slog; but you wonder what other bullshit techniques were being
    followed to maintain the 'rep'.

  12. I'm assuming most glance at the index, note a couple things that might
    conceivably be of interest, then maybe carelessly leaf through the
    magazine, possibly over a coffee or fast-food meal. That's all I do,
    if I even crack the magazine. Sometimes it goes in the "in magazines"
    pile and goes to recycling before I look at it. They have more of a
    chance to see it, and the repetition draws attention to the duplicated
    pages. If you've every shelled out for a major advertising campaign
    you know how disappointing response rates are with just a few
    placements (and sometimes with a lot of placements). But 2.3 x 0.1% is
    a lot better than 0.1%.
    Some authors jump all over the place in time and space. Some authors
    could have a good section of the book missing without you missing it
    much. Consider the difference between a Stephen King novel (tons of
    pages) and the corresponding screenplay (only 90-120 pages double
    spaced in 12 point Courier font). They probably throw away (carefully
    re-write to eliminate) 90% of the material. But I know what you mean.
    ;-) Cole's Notes?

    Best regards,
    Spehro Pefhany
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