In this circuit, a 7404 IC performs a logic invert function. A switch is connected to the pin 13 (input) of the IC and to the battery's negative side. By pushing the switch, pin 12 which is connected to pin 11 outputs a HIGH signal. Pin 10 outputs a LOW signal. LED 1 turns on and LED 2 turns off. When the switch is released, the circuit returns to its original state. In this case, LED 1 turns off and LED 2 turns on.
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