This adjustable circuit from 0 to 200 nA was found in a 90's EDN. The components can still be found relatively easily, as they are CMOS.
This circuit for the VHF band of analog TV was found in Motorola documentation from the 70s. The...
This 1989 circuit activates a protection relay if one or two phases are missing from a three-phase...
This circuit for telecommunications was found in a 1987 documentation. Connected to the...