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Latest EDN

S

Spehro Pefhany

Jan 1, 1970
0
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
 
F

Fred Bloggs

Jan 1, 1970
0
Spehro said:
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.
OH PLEASE- don't tell me...it's Highland Technology-haha.
 
J

John Larkin

Jan 1, 1970
0
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


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

http://www.spinelessbooks.com/gadsby/

John
 
S

Spehro Pefhany

Jan 1, 1970
0
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!

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

<LOL>


Best regards,
Spehro Pefhany
 
J

John Larkin

Jan 1, 1970
0
I hate doing multi-level menus using a 4-digit 7-segment display...
I'd have hoped 20x4 real characters would not be confining.

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
borderline.

John
 
J

John Woodgate

Jan 1, 1970
0
I read in sci.electronics.design that John Larkin <[email protected]
techTHISnologyPLEASE.com> wrote (in <[email protected]
4ax.com>) about 'Latest EDN', on Mon, 13 Sep 2004:
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
borderline.

Just choose your words carefully! It's not too difficult to avoid K V X
and W unless you are writing about radio stations!
 
B

Ban

Jan 1, 1970
0
John said:
I read in sci.electronics.design that John Larkin


Just choose your words carefully! It's not too difficult to avoid K V
X and W unless you are writing about radio stations!
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. :)
 
J

John Woodgate

Jan 1, 1970
0
BTW Mr.
Woodgate, autumn is coming here, but still 22°C at night. :)

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.
 
D

Dave VanHorn

Jan 1, 1970
0
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.

Sure. Clouds block the longwave IR from escaping to space.
Clear nights are always colder.
 
R

Robert Baer

Jan 1, 1970
0
Dave said:
Sure. Clouds block the longwave IR from escaping to space.
Clear nights are always colder.

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
switching?
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
drivers).
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
group.
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
output.
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).
 
L

legg

Jan 1, 1970
0
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.

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'.

RL
 
S

Spehro Pefhany

Jan 1, 1970
0
You're assuming that the readers cover the contents more carefully
than the publisher's proof-reader.

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%.
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.

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.
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'.

RL

;-) Cole's Notes?

Best regards,
Spehro Pefhany
 
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