This power supply is based on the 723 integrated circuit, which is no longer very common today. The transistor must have a heatsink and the bridge can be formed by diodes 1N4002 or equivalent.
This polarity inverter circuit for voltages down to about -12 V was found in the December 1992...
This circuit is old, from an English publication from 1979, so the indicated sensor is no longer...
This stage of two complementary transistors was found in a 1977 Radio Handbook. Transistors admit current...