Bilateral current source 2 (CB20819E)

We found this circuit in an American publication from the 1980s. Equivalent modern operational amplifiers can be used.

Star Alternator (CB20067E)
In the figure below we have the typical circuit of an automotive star alternator with the...
Passage Alarm (CB18792E)
This simple pass-through circuit was obtained in an old documentation, but it is still up to date...
Current Regulator (CB13425E)
This circuit was obtained in a 1974 National Semiconductor components and circuits manual. The...