L7809 is a voltage regulator IC from the L78xx family, which is commonly used for providing a fixed positive output voltage.
Output Voltage: 9V (regulated)
Input Voltage: Typically 12V to 35V DC (can vary depending on the current load)
Output Current: Up to 1A (depending on heat dissipation and the input-output voltage differential)
Output Tolerance: Typically ±2% (depending on the specific manufacturer)
Regulation: It is a linear voltage regulator, so the output is regulated with respect to the variations in input voltage and load current.