This circuit is from a 1967 RCA publication. The components are of the time, admitting equivalents, including the SCR that determines the maximum power of the load.
This circuit was found in a 1980s English documentation. It is intended for old xenon lamp...
This circuit was found in the July 1990 Radio Electronics magazine. It is based on the 3-digit...
This circuit can be found in a 1970 Motorola documentation. The circuit can be implemented with general...