really want to get another tattoo. I keep thinking about getting MOSFET symbols on my forearm. maybe as a half bridge / CMOS.
the opamp circuits and equations would be genuinely useful, but I suspect they would age exceptionally poorly because of the tendency for small text to blur into unreadable blobs with age. it's not anywhere near as bad as it used to be with tattoos in the 1940s, where now they just look like unintelligible globs of greenish black, but small text is still probably not gonna hold up.
I am also still partial to the idea of NPN, PNP, NFET, PFET, JFET, IGBT, SiCFET, GaN HEMT all in a row, then adding to it over time. but I might run out of space if I want the small details to hold up over time.
even that set alone would probably use up the whole forearm though.