We found this battery eliminator in a Radio Electronics magazine from August 1974. The transistor must be equipped with a heatsink and other voltages can be achieved by replacing the zener.
This circuit was obtained in a 1990 documentation and can be powered by the previous circuit...
The purpose of this Thyristor Gating for uP Applications circuit from Texas Instruments is to...
Found in the July 1970 Radio Electronics magazine, this circuit has an adjustable activation time...