This windshield wiper interval switch was found in the April 1990 issue of Radio Electronics magazine. The circuit uses integrated circuits that are still readily available.
This fuzz effect for guitars was found in an American 1980s documentation. The transistors may be the BC549...
This circuit was found in a 1963 magazine, but can still be easily assembled with some current...
This circuit came out in an American magazine that no longer exists. It's the Electronic...