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Electrical Engineering

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For questions on the history of electricity and electronics.

129 questions
Newest Active Bountied Unanswered
3 votes
2 answers
432 views

This is a question about the history of electronic symbols and standards. I'm finally starting to learn how discrete devices actually work from the entertaining yet incredibly insightful and ...
uhoh's user avatar
  • 3,556
22 votes
5 answers
5k views

The following image is a snippet from a site dedicated to collecting and restoring WW2 communications equipment. I'm interested in the wiring. What's it made of? It looks shiny, but probably not ...
Paul Uszak's user avatar
  • 7,967
1 vote
0 answers
63 views

According to this datasheet: https://www.ti.com/lit/ds/symlink/cd14538b.pdf the CD14538 is an upgrade of the CD4538 The CD14538B is interchangeable with type MC14538 and is similar to and pin-...
ErikR's user avatar
  • 5,117
0 votes
2 answers
167 views

Can you identify the name and standard purpose of the black connector in this picture? In the prototype pictured, built circa 1975, the connector is repurposed as a 2-contacts power supply connector. ...
fgrieu's user avatar
  • 2,085
1 vote
0 answers
130 views

I know they were manufactured by the Soviets, but anything more than that I'm unsure of. I really want to know who originally designed the tube and what companies manufactured it and where it was ...
rhett a's user avatar
  • 21
0 votes
3 answers
160 views

In "Formulas and Tables for the Calculation of Mutual and Self-inductance.", many equations compute the inductance of an arrangement as a length. For example, Equation 95, on p. 150, states,...
Terry's user avatar
  • 9
2 votes
1 answer
122 views

I'm curious about the names of some types of converters, such as forward and quasi-resonant converters. Why are they called forward and ...
internet's user avatar
  • 708
3 votes
0 answers
162 views

As an EE I learned all about transistors. Of course these were modern junction transistors for which we have Shockley to thank for developing the physics and the equations. So I got to thinking about ...
AI6MK's user avatar
  • 79
5 votes
6 answers
1k views

A lot of introductory resources on modern CPU present them as being built from NAND gates (see here and there for instance). Actually, it is possible to build a modern CPU using almost exclusively ...
Weier's user avatar
  • 187
0 votes
1 answer
87 views

Does anyone understand the galvanometer in Faraday's experiment to the left in the picture below? How does it operate? It looks like it uses a magnet and some xy axis the needle swings over or maybe ...
Nick's user avatar
  • 1
11 votes
4 answers
2k views

I spend almost all my tinkering time with 1970s era logic circuits, which use almost all original 7400-series TTL. I do a fair bit of repair and am now starting to design additional logic to work with ...
BZo's user avatar
  • 2,163
3 votes
0 answers
186 views

I get the sense that the Buchanan Construction Company made the first barrier blocks but I can't get much info on that. Ideal bought Buchanan and that history seems to be lost. Also, TE sells barrier ...
Davide Andrea's user avatar
  • 32.5k
6 votes
1 answer
662 views

A search for Aiken code (2-4-2-1 binary coded decimal) yields many web pages and a video with a lecturer claiming (in virtually identical language- this is from Wikipedia) (emphasis added): The code ...
Spehro 'speff' Pefhany's user avatar
  • 452k
2 votes
1 answer
214 views

The Wikipedia article on in-circuit emulators has no history section. I didn't have much luck with Google searches either. I'm wondering how far they date back. When was the first in-circuit emulator ...
hippietrail's user avatar
  • 133
2 votes
5 answers
777 views

VLSI and advances in our understanding of semiconductor physics has made it possible to have enormous computing capacity at our fingertips. However, I never really understood what "integration&...
lousycoder's user avatar
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