Easy to use digital circuits project and testing board. The logic circuit board is a complete solution for the study of logic gates. A logic gate is an arrangement of controlled switches used to calculate operations using boolean logic in digital circuits. Instrument comprises of built-in DC regulated power supply, SPDT switches provided for selecting logic '1' & logic '0', LED output indicators circuit diagram printed for gates, connections are brought out at sockets/terminals. Supplied with connecting leads & manuals.