Voltage Regulator L7809

• L7809 is a fixed-voltage integrated-circuit voltage regulator designed for a wide range of applications. The L7809 voltage regulator provides 9V Positive voltage as output and can provide local on-card regulation, eliminating the distribution problems associated with single-point regulation. Although designed primarily as a fixed voltage regulator, but it can be used with external components to obtain adjustable voltage.
• Voltage regulators are very common in electronic circuits. They provide a constant output voltage for a varied input voltage. The name 7809 signifies two meanings, “78” means that it is a positive voltage regulator and “09” means that it provides 09V as output.

Pinout Configuration

• Pin 1(Input (V+)) Unregulated Input Voltage
• Pin 2(Ground (Gnd)) Connected to ground
• Pin 3(Output (Vo)) Outputs Regulated +9V

7809 Applications

• Constant +9V output regulator to power microcontrollers and sensors in most of the projects
• Adjustable Output Regulator
• Current Limiter for certain applications
• Regulated Dual Supply
• Output Polarity-Reversal-Protection Circuit