We found this circuit in 1967 General Electric documentation. SCRs can be replaced by current equivalents. The circuit is for 110V power grid.
This high Q “rejector” or notch filter rejects signals whose frequencies are in the range...
This circuit was found in documentation from the 90's, having an LC compensation network. The...
This two-transistor circuit was found in the January 1994 issue of Electronics Now magazine....