On Thu, 28 Apr 2005 21:16:28 -0000, "Dave" wrote:


"Joe Simon" wrote in message
...


"W9DMK (Robert Lay)" wrote:

On Wed, 27 Apr 2005 20:05:51 -0000, "Dave" wrote:

it is possible as long as both output terminals are isolated from the
line
ground (and case preferably for safety!). many dc supplies connect the
negative to the case and line ground so if you tried to put them in
series
you would short one of them out through the other one's ground.

"Richard" wrote in message
news:teAbe.436$3V3.55@edtnps89...
Can someone tell me if it is possible to hook up two 12 Volt DC power
supplies in series to increase the voltage, I have two supplies that
I
would
like to do that with , one being a variable supply. I need About 25
volts
total.
Any info on this is greatly appreciated.

Richard

I am reminded of a day in our engineering lab at Westinhouse Ordnance
Department in 1958 when I was working on the depth control system for
the MK-45 (ASTOR) torpedo.

Everything aboard the fish ran on 24 volts for a variety of reasons -
tradition, it was readily available as a tap off of the main battery,
and there was a host of 24 vdc electrical equipment available from the
war years.

We had a 24 vdc motor generator set in the lab that produced all of
the 24 dc main power to the workbenches in the lab. Each workbench had
a pair of wires coming to it with a large two-pole knife switch to
connect or disconnect the 24 vdc source.

Each person working at a bench was generally engrossed in his own
private hell of trying to make whatever he was working on work
properly. As you might expect, no one paid much attention to how his
circuitry was grounded locally - if at all.

One day a lab technician named Mike working a couple of benches away
from me started laughing about the smoke that he saw rising up from
the circuit on my bench. I felt rather stupid about the fact that for
some reason my circuitry was cooking, big time. Then I noticed that
behind Mike there was a column of smoke rising up from his circuitry,
as well.

You guessed it, he had the negative side of the system grounded at his
bench and I had the positive side grounded at my bench. We had a
general meeting shortly thereafter.

Bob, W9DMK, Dahlgren, VA
Replace "nobody" with my callsign for e-mail
http://www.qsl.net/w9dmk
http://zaffora/f2o.org/W9DMK/W9dmk.html

Small World... I worked at Westinghouse in Cleveland, OH on the MK48 ADCAP
torpedo.

really small world... i was on submarines and shot (dummies anyway) mk48's
and 37's... i think those were the right numbers, its been a few years now.


Hi All,

Getting smaller....

I calibrated the sonar domes in the Navy, and then pressure tested
them for Honeywell at their Marine Systems Division here in Seattle.

Funny story about that. The pressure vessel was controlled by an
ancient program running in FORTRAN (if you can imagine that).
Honeywell asked me to consult (after I had been a Metrologist for them
some years earlier) on how to translate the FORTRAN to HP Basic.

That sort of drew a slack-jawed reaction from me, it was rather a
regressive move. I suggested that the HP computers had a very nice
Pascal that would do a lot better, and the fireworks went off.

"Pascal? Isn't that one of those European commie languages? It is
written backwards isn't it?"

Management wanted to read the code. The handwriting was on the wall
and it spelled DOOMED.

73's
Richard Clark, KB7QHC (ET1 Fleet Electronics Cal Lab, USS Holland
AS-32)

Richard Clark wrote:

I calibrated the sonar domes in the Navy, and then pressure tested them
for Honeywell at their Marine Systems Division here in Seattle.

Funny story about that. The pressure vessel was controlled by an
ancient program running in FORTRAN (if you can imagine that).

It just goes to show, life is nothing but the story-line for a Dilbert
strip.

Frame 1:
Honeywell asked me to consult (after I had been a Metrologist for them
some years earlier) on how to translate the FORTRAN to HP Basic.

That sort of drew a slack-jawed reaction from me, it was rather a
regressive move. I suggested that the HP computers had a very nice
Pascal that would do a lot better, and the fireworks went off.

Frame 2:
"Pascal? Isn't that one of those European commie languages? It is
written backwards isn't it?"

Management wanted to read the code.

Frame 3:
The handwriting was on the wall and it spelled DOOMED.




--
73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek

EXACTLY!!!!

Warmest regards,
John

The different languages "speak" to coders:
1) Assembly says, "All I know about is binary bits--if you can't twist your
mind down strange directions you have not yet even imagined--don't bother
me!"
2) Basic says, let's keep it simple, but, I pay attention to data types.
3) Fortran says, "I worship mathematicians--and stand as a tribute to them."
4) Pascal says, "I am structure, form, logic and beauty--if you come back
months later, I stand as clear, sleek, fast and as beautiful as the code you
first created (well, at least TurboPascal says all that grin)."
5) "C/C++" says, "I am all of the above--and MUCH, MUCH more, and like a
spoiled child--you can have your way with me--take care in how you use me."

Regards,
John

Oh yeah!
And COBOL says, "I have NO time for games here--I am ALL about business!"

regards,
john

Pascals' syntax is structured with beauty/logic--the very language itself is
pseudo-code...
I love the brevity of text characters in "C", and the power and "brute
force"... but Pascal has beauty....

Regards,
John

"Richard Clark" wrote in message
...
Funny story about that. The pressure vessel was controlled by an
ancient program running in FORTRAN (if you can imagine that).
Honeywell asked me to consult (after I had been a Metrologist for them
some years earlier) on how to translate the FORTRAN to HP Basic.

funny story about that... i just got tasked to dig up the fortran code for a
product my company is just thinking of upgrading to something more modern.
they just finally ran up against windows xp that refuses to run the old dos
extender the fortran was linked with... then it was wrapped with a windows
gui that just ran the old fortran executable in the background. the gui
will probably be more problems to update than the fortran if i can find the
source... it uses visual c++ 1.52 i think, the last of the 16 bit windows
compilers from ms.

On Fri, 29 Apr 2005 21:13:13 -0000, "Dave" wrote:

it uses visual c++ 1.52

Hi Dave,

My condolences. M$ asked me to come in and teach them C++ back in
1990 - what a cluster****. They fired me, never asked me back, and I
could not have felt a greater sense of relief having escaped that
narcissistic hot-house of artificial blooms.

For those of you tied to the ball and chain of their latest components
with C#, it was back in these early days (1990) that they struggled to
make that symbol # out of pairs of pluses stacked:
++
++

They were going to capture OO coding with C++++. What vanity!

73's
Richard Clark, KB7QHC

There's a great deal of Fortran programming being done today -- the
comp.lang.fortran newsgroup is very active. You're sure to be able to
get some help with the Fortran there. Fortran has been standardized for
a long time, and modern compilers handle legacy code, so it shouldn't be
difficult to recompile the Fortran code with a modern compiler (e.g.,
Compaq, Intel, Lahey) either as an EXE or DLL to be run from the GUI of
your choice. That's exactly what EZNEC does with the Fortran-compiled
NEC code.

Roy Lewallen, W7EL

Dave wrote:

funny story about that... i just got tasked to dig up the fortran code for a
product my company is just thinking of upgrading to something more modern.
they just finally ran up against windows xp that refuses to run the old dos
extender the fortran was linked with... then it was wrapped with a windows
gui that just ran the old fortran executable in the background. the gui
will probably be more problems to update than the fortran if i can find the
source... it uses visual c++ 1.52 i think, the last of the 16 bit windows
compilers from ms.

fortran is no problem, i have been doing that off and on since 1974 or so.
the problem with this project will be locating all the source. it was done
by various contractors who may not have submitted everything to our library
way back whenever this was first done. i know that at least part of it was
done with lahey tools so that shouldn't be a problem.

"Roy Lewallen" wrote in message
...
There's a great deal of Fortran programming being done today -- the
comp.lang.fortran newsgroup is very active. You're sure to be able to
get some help with the Fortran there. Fortran has been standardized for
a long time, and modern compilers handle legacy code, so it shouldn't be
difficult to recompile the Fortran code with a modern compiler (e.g.,
Compaq, Intel, Lahey) either as an EXE or DLL to be run from the GUI of
your choice. That's exactly what EZNEC does with the Fortran-compiled
NEC code.

Roy Lewallen, W7EL

Dave wrote:

funny story about that... i just got tasked to dig up the fortran code
for a
product my company is just thinking of upgrading to something more
modern.
they just finally ran up against windows xp that refuses to run the old
dos
extender the fortran was linked with... then it was wrapped with a
windows
gui that just ran the old fortran executable in the background. the gui
will probably be more problems to update than the fortran if i can find
the
source... it uses visual c++ 1.52 i think, the last of the 16 bit
windows
compilers from ms.