Published in the August 1986 issue of Radio Electronics magazine, this circuit acts as a weapon, capable of delivering strong shocks to anyone who touches it. The circuit operates at 10 kHz.
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....