Thanks for reposting this. I missed it last year, and as an EE with a misspent youth (I originally got a BA in media), I have frequently struggled with the calculus. One of the few regrets is that I didn’t learn advanced math back when my brain was primed for it. Learning calculus in mid-life is tough.

Really great intro to this topic -- rc filtering is rarely explained this intuitively.

Discussed at the time:

The 101 of analog signal filtering - https://news.ycombinator.com/item?id=40946165 - July 2024 (20 comments)

(p.s. reposts are fine after a year or so; links to past threads are just to satisfy extra-curious readers!)

TI App Notes and their design app, LT Spice, and the late Bob Pease are your friends