This circuit for high power xenon lamps was found in the November 1974 issue of Radio Electronics magazine. The project was described in an article.
In the figure we have an improved method of varying the voltage of a 7812 regulator. The circuit is...
This 5-range current measurement circuit was found in the September 1989 issue of Radio...
Found in an old English publication this circuit uses a dual gate MOSFET. Coils not specified....