General > General Technical Chat
Would anyone be capable of making a barcode reader with vacuum tubes?
Connecteur:
Just a fun thought; I'd expect it to be a big challenge requiring a good deal of creativity, if possible.
T3sl4co1l:
Yes.
Why, how soon do you want it? And at what budget? ;)
(A challenge, yes; but I can't say I'm nearly enough intrigued to do it as a freebie. Nor from transistors or ICs, seeing as ready-made solutions including optics already exist and are very affordable.)
Also, what would count as satisfactory, a 1-D barcode reader with serial output (the code that was read)? Or should it be fancier or do other things?
2-D barcodes, like QR, are essentially impossible however; reliability versus the sheer number of devices required, makes this fairly intractable. You need a good bit more than an ENIAC to decode that.
Tim
SL4P:
When I saw this, my mind immediately jumped to the old style pen/wand reader on a lead, pulled across the code by hand, but a laser scanning 1D reader would probably fall into the same category.
Not easy, and certainly not small.
BrianHG:
Watch this series. He is making an improved version of a MC14500B micro controller in vacuum tubes only using a +24 and -12v supply. There are 19 parts so far...
https://www.youtube.be/playlist?list=PLnw98JPyObn0v-98gRV9PfzAQONTKxql3
Going back further in time, here is is series on developing vacuum tube logic gates:
https://www.youtube.be/playlist?list=PLnw98JPyObn057XAfTSPdvBrr86y62SnP
Why does EEVBlog show a single video now?
It used to allow me to provide 'Playlist' links which you could click on and your browser would open a window with the complete playlist. Something went wrong.
PartialDischarge:
Barcodes?
The SR-71 used a optomechanical system to track stars and get worldwide positional navigation info.
I don't think there are engineers alive today able to do something like this again.
https://www.thedrive.com/the-war-zone/17207/sr-71s-r2-d2-could-be-the-key-to-winning-future-fights-in-gps-denied-environments
https://timeandnavigation.si.edu/multimedia-asset/nortronics-nas-14v2-astroinertial-navigation-system
https://airandspace.si.edu/webimages/collections/full/NAS-14V2%20ANS%20System.pdf
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