A somewhat unusual question: Some years ago, the following problem appeared in a test I took during my Bachelor's in electrical engineering. Later, the professor told us which textbook he took it from, but for the life of me I can't remember the name. I remember that this book had numerous creative problems, so I'm interested to find it. Can anyone help please? Someone recognizes the style maybe?

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    \$\begingroup\$ Using conductance, so it is old school (pre-handheld calculator). \$\endgroup\$ Aug 26 at 19:35
  • \$\begingroup\$ @StainlessSteelRat Perhaps. But I'm looking at the fonts and how they are spaced. Look at \$G_A\$ and how the \$A\$ has a large, but consistent, space gap between it and the \$G\$. If you look at this text here, you will also see that gap as it is a result of stupid software that doesn't understand kerning well. Compare that with how \$B\$, \$D\$, and \$E\$ (which have straighter backs on the left) are positioned. There was a certain kind of software involved here, which in my opinion and experience writing such code post-dates handheld calculators. \$\endgroup\$
    – jonk
    Aug 26 at 20:18
  • \$\begingroup\$ I don't recognize it, probably some book that emphasizes network analysis. The 1957 book (1965 printing) "Synthesis of Passive Networks " contains such doozies as this one, which the author says is the approximate equivalent circuit of a "strapped magnetron". \$\endgroup\$ Aug 26 at 20:49
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    \$\begingroup\$ @SpehroPefhany Wow, glad I never came across a strapped magnetron equivalent circuit on any of my exams! Not that I could remember that far back anyway :) \$\endgroup\$
    – John D
    Aug 26 at 21:31
  • \$\begingroup\$ Symbols and labels are non-symmetrical and not aligned well. Looks like regular local-printed workbook, may be from Asian university (they often use american resistor symbol). It can be drawn in usual text editor like MS-word. \$\endgroup\$
    – Vladimir
    Aug 28 at 8:54


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