elektroda.net NewsGroups Forum Index - Electronics Design - analog computers
BobW
Guest
Guest
Fri Aug 27, 2010 11:11 pm
"John Larkin" <jjlarkin_at_highNOTlandTHIStechnologyPART.com> wrote in message
news:bmbg765qpb5p5ipkc3d515mhhvrv9npt1e_at_4ax.com...
Quote:
That Lego-looking thing on the first page is the one I used in school. I put
a better picture of it on abse.
Bob
--
== All google group posts are automatically deleted due to spam ==
John Larkin
Guest
Guest
Mon Aug 30, 2010 4:23 pm
On Mon, 30 Aug 2010 08:17:00 -0700 (PDT), George Herold
<gherold_at_teachspin.com> wrote:
Quote:
On Aug 27, 5:32 pm, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
Digital:
ftp://jjlarkin.lmi.net/Spiral.jpg
Analog:
ftp://jjlarkin.lmi.net/Hills.JPG
John
Phil Hobbs
Guest
Guest
Mon Aug 30, 2010 4:26 pm
George Herold wrote:
Quote:
On Aug 27, 5:32 pm, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
Sacrilege, in fact. ;)
Of course there were two competing schools even inside the analogue
computing world. The first was to do everything once, at very low speed
and high accuracy, with pen plotters to capture the output. That's
great if you have one system that you want to solve. The other,
pioneered by George Philbrick, was do do it repetitively at lower
accuracy and look at the results on a CRT--much better if you're trying
to tweak the DQs to give you the results you want.
I have a book on analogue computers in aeronautics. I bought it because
it was written by one Clarence L. Johnson, who (I'm pretty sure) turns
out _not_ to be the Clarence L. (Kelly) Johnson of Skunk Works fame.
(That was a bit disappointing, but what can you do.)
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
Phil Hobbs
Guest
Guest
Mon Aug 30, 2010 4:27 pm
John Larkin wrote:
Quote:
On Mon, 30 Aug 2010 08:17:00 -0700 (PDT), George Herold
gherold_at_teachspin.com> wrote:
On Aug 27, 5:32 pm, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
Digital:
ftp://jjlarkin.lmi.net/Spiral.jpg
Analog:
ftp://jjlarkin.lmi.net/Hills.JPG
John
gherold_at_teachspin.com> wrote:
On Aug 27, 5:32 pm, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
Digital:
ftp://jjlarkin.lmi.net/Spiral.jpg
Analog:
ftp://jjlarkin.lmi.net/Hills.JPG
John
Made with an all-analogue arb, I bet. ;)
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
George Herold
Guest
Guest
Mon Aug 30, 2010 6:17 pm
On Aug 27, 5:32 pm, John Larkin
<jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
Quote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
George Herold
Guest
Guest
Mon Aug 30, 2010 7:44 pm
On Aug 30, 11:23 am, John Larkin
<jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
Quote:
On Mon, 30 Aug 2010 08:17:00 -0700 (PDT), George Herold
gher...@teachspin.com> wrote:
On Aug 27, 5:32 pm, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
Digital:
ftp://jjlarkin.lmi.net/Spiral.jpg
Analog:
ftp://jjlarkin.lmi.net/Hills.JPG
John
gher...@teachspin.com> wrote:
On Aug 27, 5:32 pm, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
Digital:
ftp://jjlarkin.lmi.net/Spiral.jpg
Analog:
ftp://jjlarkin.lmi.net/Hills.JPG
John
OK if you move down on this page you can see our "death spiral".
http://www.teachspin.com/instruments/tho/experiments.shtml
Not a very good picture I'm afraid. One axis is angular velocity and
the other angualr position.
I'd like to make some of the period doubling Lorenz butterfly type
things.
George H.
George Herold
Guest
Guest
Mon Aug 30, 2010 7:52 pm
On Aug 30, 11:26 am, Phil Hobbs
<pcdhSpamMeSensel...@electrooptical.net> wrote:
Quote:
George Herold wrote:
On Aug 27, 5:32 pm, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
Sacrilege, in fact.
On Aug 27, 5:32 pm, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
Sacrilege, in fact.
The sad news is that the ol' Tektronix 503 (saved from destruction
when I was at Vanderbilt) was dead when I turned it on last time.
I don't have another working CRT 'scope, so this project is on
indefinite hold.
George H.
Quote:
Of course there were two competing schools even inside the analogue
computing world. The first was to do everything once, at very low speed
and high accuracy, with pen plotters to capture the output. That's
great if you have one system that you want to solve. The other,
pioneered by George Philbrick, was do do it repetitively at lower
accuracy and look at the results on a CRT--much better if you're trying
to tweak the DQs to give you the results you want.
I have a book on analogue computers in aeronautics. I bought it because
it was written by one Clarence L. Johnson, who (I'm pretty sure) turns
out _not_ to be the Clarence L. (Kelly) Johnson of Skunk Works fame.
(That was a bit disappointing, but what can you do.)
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot nethttp://electrooptical.net
John Larkin
Guest
Guest
Tue Aug 31, 2010 2:46 am
On Mon, 30 Aug 2010 11:27:38 -0400, Phil Hobbs
<pcdhSpamMeSenseless_at_electrooptical.net> wrote:
Quote:
John Larkin wrote:
On Mon, 30 Aug 2010 08:17:00 -0700 (PDT), George Herold
gherold_at_teachspin.com> wrote:
On Aug 27, 5:32 pm, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
Digital:
ftp://jjlarkin.lmi.net/Spiral.jpg
Analog:
ftp://jjlarkin.lmi.net/Hills.JPG
John
Made with an all-analogue arb, I bet. ;)
Cheers
Phil Hobbs
On Mon, 30 Aug 2010 08:17:00 -0700 (PDT), George Herold
gherold_at_teachspin.com> wrote:
On Aug 27, 5:32 pm, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
Digital:
ftp://jjlarkin.lmi.net/Spiral.jpg
Analog:
ftp://jjlarkin.lmi.net/Hills.JPG
John
Made with an all-analogue arb, I bet. ;)
Cheers
Phil Hobbs
Both were generated by a VME arb. The spiral is a test pattern that
turned out to be about six lines of 68K assembly code, basically two
32-bit integrators eating one another's tails, with some right-shifts
in there to add a little damping.
Some guys at LLNL did an analog arb. It was a pc board, FR4 with
copper on both sides. They machined a pattern that made a transmission
line whose reflection was the waveform they wanted. Weird patterns.
John
Phil Hobbs
Guest
Guest
Tue Aug 31, 2010 2:51 am
John Larkin wrote:
Quote:
On Mon, 30 Aug 2010 11:27:38 -0400, Phil Hobbs
pcdhSpamMeSenseless_at_electrooptical.net> wrote:
John Larkin wrote:
On Mon, 30 Aug 2010 08:17:00 -0700 (PDT), George Herold
gherold_at_teachspin.com> wrote:
On Aug 27, 5:32 pm, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
Digital:
ftp://jjlarkin.lmi.net/Spiral.jpg
Analog:
ftp://jjlarkin.lmi.net/Hills.JPG
John
Made with an all-analogue arb, I bet. ;)
Cheers
Phil Hobbs
Both were generated by a VME arb. The spiral is a test pattern that
turned out to be about six lines of 68K assembly code, basically two
32-bit integrators eating one another's tails, with some right-shifts
in there to add a little damping.
Some guys at LLNL did an analog arb. It was a pc board, FR4 with
copper on both sides. They machined a pattern that made a transmission
line whose reflection was the waveform they wanted. Weird patterns.
John
pcdhSpamMeSenseless_at_electrooptical.net> wrote:
John Larkin wrote:
On Mon, 30 Aug 2010 08:17:00 -0700 (PDT), George Herold
gherold_at_teachspin.com> wrote:
On Aug 27, 5:32 pm, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
Digital:
ftp://jjlarkin.lmi.net/Spiral.jpg
Analog:
ftp://jjlarkin.lmi.net/Hills.JPG
John
Made with an all-analogue arb, I bet. ;)
Cheers
Phil Hobbs
Both were generated by a VME arb. The spiral is a test pattern that
turned out to be about six lines of 68K assembly code, basically two
32-bit integrators eating one another's tails, with some right-shifts
in there to add a little damping.
Some guys at LLNL did an analog arb. It was a pc board, FR4 with
copper on both sides. They machined a pattern that made a transmission
line whose reflection was the waveform they wanted. Weird patterns.
John
Fun! I've used coax stubs to invert the sign of the leading edge of a
TDR pulse, but that's as far as I've gone in that direction.
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
WallyWallWhackr
Guest
Guest
Tue Aug 31, 2010 3:56 pm
On Aug 30, 9:52 am, George Herold <gher...@teachspin.com> wrote:
Quote:
On Aug 30, 11:26 am, Phil Hobbs
pcdhSpamMeSensel...@electrooptical.net> wrote:
George Herold wrote:
On Aug 27, 5:32 pm, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
Sacrilege, in fact. ;)
The sad news is that the ol' Tektronix 503 (saved from destruction
when I was at Vanderbilt) was dead when I turned it on last time.
I don't have another working CRT 'scope, so this project is on
indefinite hold.
George H.
Of course there were two competing schools even inside the analogue
computing world. The first was to do everything once, at very low speed
and high accuracy, with pen plotters to capture the output. That's
great if you have one system that you want to solve. The other,
pioneered by George Philbrick, was do do it repetitively at lower
accuracy and look at the results on a CRT--much better if you're trying
to tweak the DQs to give you the results you want.
I have a book on analogue computers in aeronautics. I bought it because
it was written by one Clarence L. Johnson, who (I'm pretty sure) turns
out _not_ to be the Clarence L. (Kelly) Johnson of Skunk Works fame.
(That was a bit disappointing, but what can you do.)
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot nethttp://electrooptical.net
pcdhSpamMeSensel...@electrooptical.net> wrote:
George Herold wrote:
On Aug 27, 5:32 pm, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
Fun, Since reading "Chaos" by Gleik I've wanted to build an analog
computer and have it draw pretty pictures on a CRT screen. (It would
seem wrong to look at the images with a digital 'scope.)
George H.
Sacrilege, in fact. ;)
The sad news is that the ol' Tektronix 503 (saved from destruction
when I was at Vanderbilt) was dead when I turned it on last time.
I don't have another working CRT 'scope, so this project is on
indefinite hold.
George H.
Of course there were two competing schools even inside the analogue
computing world. The first was to do everything once, at very low speed
and high accuracy, with pen plotters to capture the output. That's
great if you have one system that you want to solve. The other,
pioneered by George Philbrick, was do do it repetitively at lower
accuracy and look at the results on a CRT--much better if you're trying
to tweak the DQs to give you the results you want.
I have a book on analogue computers in aeronautics. I bought it because
it was written by one Clarence L. Johnson, who (I'm pretty sure) turns
out _not_ to be the Clarence L. (Kelly) Johnson of Skunk Works fame.
(That was a bit disappointing, but what can you do.)
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot nethttp://electrooptical.net
"Chaos" was great. The program back then was "FracTools"
and it is impossible to find any more. It calculated every pixel
of the posistion (zoom) chosen. It was a real nice engine,
but it ran under a weird defunct OS called "Gem".
Nowadays, they calculate a much "rougher" "overview"
where they then recalculate values within those. The
problem is that the final resolution image is grainy and has
blocky artifacts. I liked the exact, per pixel calculation that
FracTools used, but cannot find render engines that work
that way any more.
What I did find is "The Best Little Screen Saver In The World"...
It is for your music player (WinAmp, Media Player, Flac, Etc)
It also has a screen saver mode, but what it does is construct
and render fractal imagery of various types on top of pallete
shifted images of your photo gallery behind it. That IS cool.
It makes for the best screen saver Windows ever had, and
is very much worth it, since it is fully cusomizable and script
driven.
It is called " G-Force" and comes from Sound Spectrum
http://www.soundspectrum.com/g-force/
Leon
Guest
Guest
Tue Aug 31, 2010 5:15 pm
On 27 Aug, 22:32, John Larkin
<jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
Quote:
http://www.adi.com/pdfs/Howe2June05.pdf
John
John
I worked on an English Electric LACE analogue computer (designed in
1954) when I was a student at the Kidsgrove plant around 1963.
Jasen Betts
Guest
Guest
Sat Sep 18, 2010 2:17 pm
Quote:
"Chaos" was great. The program back then was "FracTools"
and it is impossible to find any more. It calculated every pixel
of the posistion (zoom) chosen. It was a real nice engine,
but it ran under a weird defunct OS called "Gem".
and it is impossible to find any more. It calculated every pixel
of the posistion (zoom) chosen. It was a real nice engine,
but it ran under a weird defunct OS called "Gem".
Gem was not an OS.
Try fractint.
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elektroda.net NewsGroups Forum Index - Electronics Design - analog computers
