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.
This project was found in a 1981 documentation. It consists of an interesting audio oscillator that...
This circuit, which can only be used with incandescent lamps, is adapted to the common wall...
This simple transistor gain test acts as an oscillator for the transistor under test. The circuit is...