NOT This AND That

Project Number: 50

OBJECTIVE: To demonstrate the concept of a NAND circuit.

Description: Build the circuit on the left and test the combinations of the slide switch (S1) and press switch (S2). If you compare it to the AND circuit in Project #48, you can see the LED (D1) lights in the opposite combinations of that circuit. Hence, we refer to it as a NAND circuit (short for "NOT this AND that"). This circuit can also have more or less than two inputs, though when it only has one input it is referred to as a NOT circuit. Like the OR, AND, NOR, NAND, and NOT are important building blocks in computers.