Found in a 1960 General Electric documentation, this crowbar circuit blows the fuse in case of excess current. The circuit is for 12 V sources triggering between 14 and 17 V.
This circuit monitors an old-style analog telephone line. We found it in the September 1991 issue...
In the figure we show how two diodes can be used to simulate the center tap of a push-pull driver step....
This circuit was found in a General Electric / RCA documentation from the 1980s. The circuit is...