This is a circuit suggested by Linear Technology in a 1980s documentation. The integrated circuit is from the era. Observe the input and output voltage.
This fuzz effect for guitars was found in an American 1980s documentation. The transistors may be the BC549...
Suitable for recovering tape recorded media from a common tape player mechanism, this circuit is...
The basic circuit of a flip-flop for use as a frequency divider or one-bit memory is shown here....