Recently been trying to find interesting sources of weird electronics knowledge, circuit snippets and ideas outside of the synth/pedal scene. Inspired by people like Nonlinear Circuits who has found chaos and generators and neurone simulators etc in scientific literature and adapted them into modules. Excited about the concept that eurorack is basically just an ‘Analog Computor’ a lot of the time 
Going to post some stuff in this thread (better than only sharing it with 3 nazis, 2 compulsive arguers who even knowingly argue with a markov chain chatbot, 1 literal russian troll and 2.5 decent electronics people over on Noiseguide), please do share anything similar 
Found a good site via the manual for a vacuum tube op-amp - The manual itself i’ve found quite educational about op-amps generally (after years of electronics tinkering just finally starting to get what they even do) and the site containsa massive list of documents many of which look interesting or at least have some cool 50’s electronics catalog design with photos of giant equipment 
searching more modern stuff too in academic literature, eg https://www.researchgate.net/publication/318604292_Atypical_transistor-based_chaotic_oscillators_Design_realization_and_diversity
I guess NASA have a tonne of interesting stuff. So far found this 1976 compilation of general circuits https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19760013284.pdf
http://sci-hub.tw - good site for bypassing unfair paywalls on research that is supposed to be open to all.