Analog computing, one thing I'm glad I learned a little about! Also made part of the tennis for two game, and occasionally think about adding features. (Course, knowledge of digital electronics keeps interfering. In fact I used two 74-series logic chips in there.) Here's my build log, with everything that makes me cringe after a few years left in tact: https://blog.qiqitori.com/2024/08/implementing-tennis-for-tw...