Block Diagram Of 78xx. Regulated power supply block diagram working principle of regulated power supply block diagram of regulated power supply. Pin diagram of the ic 7805 is shown in the diagram below.
Here the operating amplifier performs as an error amplifier. This is obtained by using a 033uf capacitor at the input side. Topics to be dealt 78xx series 79xx series 317 variable regulators 1723 switching regulators.
Adjustable voltage outputthe output voltage in this instance would be higher than the input voltage as an example with the 7805 voltage regulator you would have the ability to provide an input of 2v and the obtain an output of 7v to 20vthe 78xx series can handle variable voltage with the help of a 741 op amp and 10k potentiometer.
For proper regulation the input to the ic should be pure dc. First pin is the ground pin and is common to both input and output. The internal block diagram of ic 7805 is represented in the figure below. 7805 voltage regulator pin diagram.