Found in an EDN from the 90s, this regulator makes use of the integrated circuit of the time. The input can be from 8 to 20 V.
This two-transistor constant current source is from a 1968 documentation. Modern equivalent...
We found this circuit in an old documentation. The integrated circuits used are specific to...
This circuit was found in a 1964 Electronic Design. The circuit can be implemented with equivalent...