We found this circuit in a 1967 El3ectronics World. The transistors are from the era but can be replaced by current equivalents. The circuit is for 5 A loads.
With this circuit it is possible to use a common hair dryer as a hand dryer. The circuit is timed...
This circuit was obtained from an American documentation from the 90's. Inductors are critical...
This configuration from the 1970s can be applied to modern equivalent operational amplifiers. The...