Total posts : 45366
Nice find and thanks for sharing. The thing that struck me was the old mica caps which were shown in the picture of the protoboard circuit. Us old timers remember those and can even read the color code! It even looks as if the author used telephone trunk wire to extend the leads. That brings back memories.
Sometimes useful parts can be found in surprising places and this is a good example. It is nice to see the “hacker” spirit demonstrated once again.