Circuit Diagram Of 7812 Voltage Regulator. This variable power supply is using 7805 7809 7812 or 7815 voltage regulators where the last 2 digits represents the maximum output voltage of the ic. Truly speaking it is a complete standalone voltage regulator.
As we can observe through the voltage probe when an input voltage of 25v is provided through the 7812 ic the output voltage we obtain is 12v dc. For example in the diagram above the input voltage is 24 volts. I will show you an interesting concept.
It is very simple to understand 7812.
They provide a fixed regulated power supply. 7812 pin2 connections are also explained in my regulator circuit diagram. This is a 12v dual power supply circuit diagram using 7812 and 7912. Circuit diagram of fixed positive voltage regulator.