Ideas
Every once in a while I look at electronic project idea sites. Here are "some" good ones:
http://www.redcircuits.com/
http://www.sm0vpo.altervista.org/
http://ludens.cl/Electron/Electron.html
http://techlib.com/default.htm
In a way these sites are the internet equivalent of my old favorite "101 Projects" magazines
which can be found on the wacky,wonderful, World Radio History site:
https://worldradiohistory.com/Hobbyist_Special_Editions.htm
my favorite is the 1974 version:
https://worldradiohistory.com/BOOKSHELF-ARH/Technology/Hobbyist-Specials/101-Electronics%20Projects-1974.pdf
I'm not necessarily going to copy/build a circuit but might get an idea from something presented.
BTW, "some" to me indicates the number of 4, I read that once in a comic book - I don't remember how to diagram a sentence, how to extract a cube root or Maxwell's equations but that one panel from a comic book, yes, although I don't remember anything else from that comic although it might have been a Justice League of America DC comic :)
Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm