7809 IC

A LM7809 Voltage Regulator is a voltage regulator that outputs +9 volts. The LM7809, 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 9 volts. Pin 2 (Ground): Ground pin establishes the ground for the regulator. Pin 3 (Output Pin): The Output pin is the regulated 9 volts DC.