This circuit was suggested by General Electric / RCA in a 1980s documentation. The components are of the time and the circuit must be powered by symmetrical source.
This circuit, from the 90's, is intended for operation with vinyl record players of the time, as...
Using a zener diode it is possible to change the linearity of the scale of an analog instrument by...
Found in American documentation from the 1980s, this circuit prolongs the ringing of a doorbell or chime...