Here AND, OR, NOT Gate is made using NAND Gate so we call NAND as Universal Gate. This is also true for NOR Gate. But we prefer NAND gate over NOR, to design basic logic circuits because of low logic effort and delay.
NAND as Universal Gate
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. Other components are :-
3 Pc of 470 ohms, 3pcs LED, 5 pcs mini SPDT Switch, 1 Rocker Switch, 9V Battery with Snap and one IC Varo board.
Circuit Diagram of NAND as Universal Gate
Advantage: We can use up spare gates of bought NAND IC for different purpose.
You may also be interested in our next project: NOR as Universal gate.