Suggested by a 1968 documentation, this circuit limits the current of a regulator and can be adapted to other currents. The transistors are from the era.
The assembly of this regenerative receiver for medium waves with 4 transistors was described in an...
This frequency divider circuit that generates a ladder-shaped signal was found in the June 1968...
This circuit was obtained in a 1991 Electronics Handbook. The publication no longer exists, but...