7402 is a Quad 2-input NOR gate device. In this simple circuit, the 7402 NOR chip takes inputs at terminals 2 and 3. If both inputs are LOW, the output goes HIGH. The LED illuminates. If either pin 2 or 3 on the chip are connected to +5V, the LED will extinguish. Basically, a NOR gate is a combination of OR gate followed by an inverter. Pin 7 connects to ground and pin 1 connect to +5V. The 7805 IC converts 9V into 5V DC.
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