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.
This circuit delivers at its output a voltage that proportional to the amplitude of the input...
This bargraph-type circuit employs a not very common integrated circuit today, but can be adapted...
Found in a Westinghouse Silicon Power Handbook from the 60s, this circuit makes use of period...