This circuit is from 1964 documentation but can be easily implemented based on current components. Input waveforms and detection are shown next to the diagram.
This protective circuit for power lines was found in a Radio Electronics from November 1957. The...
This circuit, from a 1968 Electronics World, is fed directly by the rectified voltage from the...
This circuit makes use of a commercial type current transformer. The circuit is from a 2005 Linear...