This CMNOS crystal-based circuit generates a 2 Hz signal. It was found in the October 1994 issue of Electronics Now. The output signal is square.
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...