This is the traditional configuration of a standard lamp with a rectifier. Only incandescent lamp can be used and for the rectified version a 5 W lamp.
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...