I’m pretty similar in a respect to this. Work has me dealing with complex interfaces as well as circuits. There is a crossover (pun intended) in the filter design of a passive filter network for a speaker to electric power systems (ac vs dc differences ignored) but still enjoy the challenge & frustration of the process. Still consider it a nerd hobby though as the cool kids don’t seem to be fucking around with electrical circuit design & combining it with woodworking.Sci Fi is probably the only big one. Try to watch everything I can in this category.
I don't game or collect anything and not sure what else is considered nerdy lol.
I work in tech so I am constantly like reading about things related to software development, data, AI, etc but because it's related to work don't really consider that.