NAND as Universal Gate
By combination of NAND Gate we can construct AND, OR, NOT (basic logic gates) so we call NAND as Universal Gate. This is also true for NOR Gate. But we prefer NAND gate over NOR because of low logic effort and delay. For input level (High and Low) I have used 2 way switch and to test its output, LED is used.
IC CD4011 contains quad NAND Gates. This type of CMOS IC also have buffered outputs which improve transfer characteristics by providing very high gain. Total six Gate is needed in this project so I have used two IC. First IC is used for NOT, AND Gate and second for OR Gate. Two gate of IC are left idle.
IC CD4011 = 2 Pcs
Resistance 470 ohms = 3 Pcs
LED = 3 Pcs
Mini SPDT Switch = 5 Pcs
Rocker Switch = 1Pc
9V Battery with Snap
IC Varo board.
Circuit Diagram of NAND as Universal Gate
Advantage: We can use up spare gates of bought NAND IC for different purpose.