My favorite is Dan Sandin's analogue video synth, from U of I Chicago circa 1971: https://www.youtube.com/watch?v=8qh6jRzjmcY https://www.youtube.com/watch?v=8q

My favorite is Dan Sandin's analogue video synth, from U of I Chicago circa 1971: https://www.youtube.com/watch?v=8qh6jRzjmcY https://www.youtube.com/watch?v=8qh6jRzjmcY He distributed the schematics free under a "copy it right" philosophy: you had his blessing as long as you didn't mess around with the schematics. All you had to do was send him a video tape asking for a copy, and he'd put them in the mail. If you had questions? Send another tape. Ten or so years ago I emailed him and got a copy when I couldn't find them on google. They're fantastic, all hand drawn circuit diagrams and pcb layouts. Unfortunately some of the more important ICs are long out of production, and finding suitable replacements is beyond my skill. Not only that, the board he used to generate NTSC color was actually pulled from a specific model of video camera. To reproduce it today you'd have to either design a replacement from scratch or find a different approach.