7805 Voltage Regulator IC
LM7805 Voltage Regulator is a voltage regulator that outputs +5 volts.
The LM7805, like most other regulators, is a three-pin IC.
Pin 1 (Input Pin): The Input pin is the pin that accepts the incoming DC voltage, which the voltage regulator will eventually regulate down to 5 volts.
Pin 3 (Output Pin): The Output pin is the regulated 5 volts DC.