This circuit was found in the March 1979 issue of Radio Electronics magazine. Integrated circuits must be equipped with heatsinks. The maximum current is 1 A.
The oscillator shown in the figure generates a rectangular signal with a 50% active cycle (square)...
This power supply can be implemented with a TIP32 providing an adjustable output at the 2k2...
This switched circuit was found in an old documentation and no information about the transformer...