Created to serve as a booster for TV signals in the UHF band, this circuit was found in the March 192 Radio Electronics magazine. Assembly is critical, requiring a special board layout.
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....