Fixed Voltage Power Supply

this is a fixed voltage power supply, in this power supply we use certain components:-

1) Transformer (12 volts)

2) Bridge Rectifier

3) Voltage Regulator (7805 for 5 volt supply, 7809 for 9 volt supply)

4) Capacitor as shown in circuit diagram

5) Diode (D5 IN4007)

In this voltage regulator regulates the power supply to such a extent which is required in the project, so you can use 7805 for preparing 5 volt supply and for 9 volt supply you use 7809.