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Old 03-10-2015, 04:43 AM   #76
Andy44
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Originally Posted by Notebook View Post
 Does this mean I'm back in fashion? (#55 above)

N.
LOL what's old is new!

Thing about a lot of these newer analog synths is that they use the analog circuits for that great sound but they use microchips and firmware to make the units smaller and more versatile, with USB connections and so forth. A good blend of old and new. Even the reissues like the new ARP Odyssey have these features.

Not the Moog System 55 pictured above, of course, it's basically a wire-by-wire reconstruction of the original, and it's made for the purist. Also, it's $35,000! And they are only building 55 of them, all hand made.

While that's cool and all, it'd be nice if Moog would make a modular which was compatible with current ones, like the Eurorack and so forth.
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Old 03-10-2015, 09:53 AM   #77
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Last time I looked, the ETI 4600 synth had a fair community going. All the i/c were in sockets, and of course its all mid 70's design, no dsp or similar. It did have specialised i/c and these are difficult to get.
I really did it as a long term project, my soldering got better and it was before cable-ties, so we were taught cable-looming at college.
Should get around to finishing it off, but...

N.
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Old 03-10-2015, 02:47 PM   #78
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Speaking of synths and shepard tones, I once spent ages trying to do a shepard tone based on clavia's Nord Modular G2 demo software. (Allows you to set up oscillators, filters, etc. - worth a play by the way.)

Never got it to sound quite convincing - I could still hear the notes start at the beginning of the range, and fade out at the end. Oh well!
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Old 03-10-2015, 08:31 PM   #79
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Pocket calculator - Curt Herzstark style:

The CURTA
https://www.youtube.com/watch?v=OynMJB-2J1o

I'd love to own one of these! Sadly they go for rather a lot of money..
However there's a flash emulator so you can play at crunching numbers.

http://www.vcalc.net/curta_simulator_en.htm
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Old 03-10-2015, 08:58 PM   #80
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About Curta:

http://www.darkroastedblend.com/2008...echanical.html
http://www.numberphile.com/videos/curta_calculator.html

I think I found these links starting from YT Vi Heart's channel...

Last edited by Ripley; 03-10-2015 at 09:12 PM.
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Old 06-05-2015, 02:10 AM   #81
Andy44
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Years ago I was in the Smithsonian American History Museum in DC, looking through the computer tech display, and there was an exhibit about something called "SAGE" or "Semi-Automatic Ground Environment". This was the massive integrated air defense system for North America, which involved the use of gigantic IBM AN/FSQ-7 computers to process data from radar sites and direct fighters and surface-to-air weapons in the event of a Soviet bomber attack. The computers used thousands of vacuum tubes and there were dedicated cooling towers to keep the processors cool. These machines were all networked via hundreds of phone lines and modems. And this was in the 1950s!

I am no warmonger, but I love this old technology, and the audacity to think such a thing could be accomplished when nothing like it had ever been dreamed of before. Was the system effective? We'll never know, thankfully. Other nations' later attempts at integrated air defense met with mixed results (eg. North Vietnam, Egypt, ect.). But this was built from scratch and represents a landmark in systems engineering history.

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Old 06-23-2015, 10:55 PM   #82
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It isn't really retro, but I thought it was cool.
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Old 06-23-2015, 11:11 PM   #83
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Quote:
Originally Posted by C3PO View Post
 It isn't really retro, but I thought it was cool.
Electron microscope slow-motion video of vinyl LP - YouTube
That was really cool, except for the part where ruins an apparently good vinyl copy of Switched-on Bach.
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Old 06-24-2015, 06:25 PM   #84
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At least it gave its life for the benefit of science.

I must say, I have never heard of that ingenious capacitive video disc.
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Old 06-24-2015, 07:39 PM   #85
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Maybe not exactly retro yet, since they are still used...
But cool enough.

Some time ago i came across a Xenon Short Arc lamp from a movie projector.
2.5KW, or 100000 lumen.
I wanted it to shine...
And shone it did.



The lamp is Tungsram XHP 2500/2, made in 1969.


Was said to be new old stock, appears to be somewhat used.


I made a box for it.
The driver is underneath, the lamp goes into a plexiglass enclosure.
The plastic is dispersive, UV absorbing and hopefully thick enough to absorb the shrapnel from the lamp bursting (60 atm of xenon gas inside, anxious to get out).


Underneath the lamp is a fan.
It keeps it cool, but i still don't know if it's a good idea to let it blow at the lamp like this.
It's surprisingly difficult to find any detailed design guidelines on making enclosures for such lamps.
They would say to provide 6 m/s of cooling airflow, and on the next line say not to blow air onto the lamp...


But it seem to work so far.


It's quite bright in the lab just before ignition.


But it gets so much brighter after.
None of the original lights were turned off - next to the big one they are as good as not there.
I measured 15000 lux, 2 metres away perpendicular to the box.


The power of the sun...


...on the top of your desk.


And that's how a box of sunshine was made.

I have no idea what to use this for.
Mood recovery during polar nights?
Sunbathing on a rainy day?
Make some sort of an art installation (aka a lighthouse) on the roof of the building?
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Old 06-24-2015, 08:56 PM   #86
Fabri91
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Fog lamp for the car?
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Old 06-24-2015, 09:10 PM   #87
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Quote:
Originally Posted by Artlav View Post
 They would say to provide 6 m/s of cooling airflow, and on the next line say not to blow air onto the lamp...

That's right - if you blow the air directly against the lamp, you could cause uneven temperatures and thermal stress, that could make the lamp burst.

In your case though, the lamp is in a more evenly distributed airflow and hot and cold spots would be prevented.
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Old 06-24-2015, 09:15 PM   #88
MaverickSawyer
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Quote:
Originally Posted by Artlav View Post
 I have no idea what to use this for.
Mood recovery during polar nights?
Sunbathing on a rainy day?
Make some sort of an art installation (aka a lighthouse) on the roof of the building?
Does it have to have a use? It's awesome... 'nuff said.
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Old 06-25-2015, 05:23 AM   #89
Andy44
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Quote:
Originally Posted by Artlav View Post
 I have no idea what to use this for.
Mood recovery during polar nights?
Sunbathing on a rainy day?
Make some sort of an art installation (aka a lighthouse) on the roof of the building?
Navigation beacon for astronauts?

Revenge machine for people who don't dim their headlights?
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Old 06-25-2015, 06:43 AM   #90
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Put a nice mirror behind it and make a laser!
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