I was wondering when the term "topology" came into common use when describing the layout of circuits. Back in the mid 60's through mid 70's I was very into the electronics hobby, read every article and construction project I could find, but never came across that term as I remember. Then in the late 90's, when I got back into things, the first book I bought about electronics in all those intervening years was "Tonnes of Tone", about guitar amps. That's when I first encountered the term topology, and it was used heavily in that book. Another thing from that book was the designation of component values....a 4.7uF cap was called a 4U7, a 4.7k resistor was a 4k7, etc. I wondered if this was a European type designation (even tho the book was published in Canada).
So, did topology become a "thing" since my last stint in electronics, or did I just miss it?