This simple circuit is a continuity test that, in addition to testing resistors, can also test other components. Power is provided by batteries and the LED can be of any color.
We found this circuit in an American documentation from the 90s. The circuit applies to vehicles...
This circuit was obtained in an old American manual. The circuit is valid for any operational. The...
This traditional LED sequencer circuit was found in the February 1992 Radio Electronics magazine. The...