General > General Technical Chat
What analog projects are you after in 2022/23?
RoGeorge:
--- Quote from: jonpaul on November 25, 2022, 11:15:30 pm ---speech scrambling system
--- End quote ---
Wow, very nice! :-+
Never looked into audio scramblers, now I'm curious, how does it work?
jonpaul:
ROgorge, Rebonjour,
Studied and lectured on SIGSALY and modern digital media history since 1990s.
After 20 yrs or research and a year to design, construct and debug, VOILA! The only SIGSALY Quantizer (ADC) reconstruction.....
JUST one of 72 six level flash ADC in SIGSALY.
the only part ever reconstructed according to the Agencies and Museums.
The entire SIGSALY system filled 40 racks and a room, took 30 kW and 15 techs to run!
Read all about SIGSALY at NSA NCM
https://scienceblogs.de/klausis-krypto-kolumne/2019/03/03/rebuilding-a-part-of-the-legendary-sigsaly/
My articles: IEEE Spectrum Feb 2019
https://spectrum.ieee.org/rebuilding-a-piece-of-the-first-digital-voice-scrambler
https://spectrum.ieee.org/sigsaly-analogtodigital-converter-construction-and-debugging
Your thoughts appreciated !
Bon Weekend
Jon
RJSV:
Curious, (I only know vacume tubes from audio stuff.)
What type, in general, is it ramp gen and comparator, and did it need sample and hold ?
And, what speed ?...Does it have an interface, digital type ?
Now I know that the assembly you show isn't the whole sys, but just the general spec.s ?
Does it need special thermal stability ? Thanks.
rstofer:
--- Quote from: RoGeorge on November 26, 2022, 08:27:33 am ---
--- Quote from: VSV_electron on November 25, 2022, 08:43:38 pm ---How do you know it wasn't [a joke]?
--- End quote ---
I know from other posts in this forum that he likes analog computing:
Image from here: https://www.eevblog.com/forum/testgear/what-did-you-do-with-or-to-your-oscilloscope-today/msg3030544/#msg3030544
Fun note, the name itself of "analog" electronic came from the fact that linear circuits with R, L, and amplifiers can be an analog of the differential equations met in the physical world (analog circuits able to simulate, and thus solve, other non-electronic problems we face in our day-to-day real world).
--- End quote ---
I had no intention of being sarcastic nor of making a joke. Just about my ONLY interest in analog is in terms of analog computing. I have two of the Comdyna computers plus I have built another from a design by Dr. Vogel:
http://www.analogmuseum.org/english/homebrew/vogel/
There are actually two problems patched on that GP-6: One is the Mass-Spring-Damper and the other is the swinging door seen in some restaurants between the cooking and serving areas.
rstofer:
The Dr. Vogel Analog Computer linked above has 2 integrators plus some other toys. This allows integration of acceleration to get velocity and integration of velocity to get displacement. Thus it is suitable for many 2d order ordinary differential equations. I added a test point so I could connect a scope but other than that, I just used the plans.
It is a high capable machine for the money and in terms of education, it's a treat!
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