This circuit for the power grid was found in the June 1969 Radio Electronics magazine. The SCR and diodes are rated according to the power of the controlled load.
This circuit turns on a lamp after the time set on the potentiometer. The circuit is from a Radio...
This circuit was suggested by General Electric in a 1969 documentation. The transistors are of the...
Found in a 1991 PE Hobbyst Handbook, this unit can actually supply 1.5 A with the LM317 and 3 A...