![]() This circuit consists, in its most basic form of two gates, an XOR gate that produces a logic 1 output whenever A is 1 and B is 0, or when B is 1 and A is 0. The circuit should now be dark if both switches are off, the green LED should light if only one switch is on, and the red LED should light if both switches are on. Binary arithmetic is carried out by combinational logic circuits, the simplest of which is the half adder, shown in Fig. Connect the output for the AND gate (pin 3) to the input for the red, or carry, LED. Connect both switch X and Y to the input of the first AND gate (pins 1 and 2) on the 7408 chip.
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