This circuit was found in an American Poptonics in November 2001. The LED can be of any type, one red and one green. The circuit, which can also analyze TTL circuits, is powered by the circuit being analyzed.

This circuit was found in an American Poptonics in November 2001. The LED can be of any type, one red and one green. The circuit, which can also analyze TTL circuits, is powered by the circuit being analyzed.