NAND as Universal Gate
By combination of NAND Gate we can produce AND, OR, NOT (basic logic gates) so we call NAND as Universal Gate. It is easiest to produce and widely available. This is also true for NOR Gate. But we prefer NAND gate over NOR because of low logic effort and delay.
In this project we will see how this circuit function. Our aim of this experiment is to study and verify the truth table of logic gates. For input level (High and Low) We have used 2 way switch and to test its output, LED is used.
In this project we will use IC (Integrated Circuit). 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.
Components :-
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.
Procedure:
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Check the components for their working.
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Insert the appropriate IC correctly into the IC base, Breadboard or Zero PCB
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Make connections as shown in the circuit diagram.
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Verify the Truth Table and observe the outputs..
Circuit Diagram of NAND as Universal Gate
Advantage: NAND gate is cheaper and widely available. We can use up spare gates of bought NAND IC for different purpose. It helps in reducing the number of interconnections and the total number of gates in digital systems.