This simple continuity tester, whose configuration can be found several times on this site, is powered by only 2 batteries providing the indication on an LED.
This control for motors with current up to 1.5 A was obtained in a 1989 publication, but it can...
This circuit preheats incandescent lamps, thus avoiding the impact of the current when switching on,...
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...