This circuit was obtained from a Radio Electronics from the 90's. The circuit limits the strength of an audio signal preventing saturation. Equivalent operational amplifiers can be tried.
This interesting circuit for analog TV selects the first line of a frame. The circuit was found in a...
This circuit was found in a 1967 EEE. The components are from that time, but the circuit can be...
Found in a 1968 documentation, this circuit provides symmetrical voltages determined by component...