This current switch was found in a Radio Electronics from November 1957. It triggers the current determined by the electromechanical sensor, a polarized relay of the time.
This transistor tester circuit has the advantage of using a constant current source in the tests....
This circuit is from a 1977 publication for radio amateurs presenting a crowbar protection. The...
Suggested by a 1968 documentation, this circuit limits the current of a regulator and can be...