This power supply uses a single-winding transformer. We found it in July 1984 Radio Electronics magazine. The integrated circuit must be equipped with a heat sink.
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...