This circuit was found in Radio Electronics magazine from August 1966. The transistors are from the time and the power supply from the power grid is included.
This circuit was found in a 1965 Radio Shack documentation. The transistors are from that time....
This is a typical source of the time (1989) using the well-known regulator integrated circuit 723....
The integrated circuits used in this circuit are from the 70s and are therefore no longer common in...