11 Volt Power Supply Circuit using LM7811

Hello, readers welcome to the new post. In this post, we will discuss 11 Volt Power Supply Circuit using LM7811. The power supply is the main part of the electronic industry and engineering projects. Power supply plays an important role to operate the devices according to the required voltage either having the high volts at input. It is normally used to convert other types of energy like solar, mechanical etc. into electrical energy. A power supply is also known as a power supply unit (PSU), or power adapter.

There are different types of power supplies like DC power supply, AC power supplies etc. In today’s post, we will take a detailed look at different types of power supplies, their working, applications, and some other related parameters. In this post, we will discuss the circuit configuration of the 11-volt power supply circuit that will be created through the use of the LM7811 voltage regulator. In this tutorial, you will also learn how you can get project creation services and related parameters and products from PCBWAY which is the best in electronic services and PCBA on one platform. Before going to discuss the 11 Volt Power Supply Circuit using LM7811 we have some overview of the Power supply that will help to understand the circuit of this project.

Table of Contents

What is Power Supply

A power supply is an electrical tool that is used to supply electrical energy to an electrical load connected to it.
The basic function of a power supply is to transform the electrical current received from the input source to a level of current, voltage and frequency that can serve the load.

Due to this, power supplies are also referred to as electrical energy converters.
Power supplies come in two forms, the first is a stand-alone supply that supplies power to the load, and the second is built-in, which is assembled with the device to use the power.
Examples of built-in power supplies are computers, laptops, mobiles, etc.
There are some other functions that the power supply does is to maintaining the current used by the load at a safe level, interrupting the use of the current in case of any fault, to improve the P.F to store the energy for further use.
There are 2 main connections in power supplies, the first is the input which receives the electrical current from the source and the second is the output which has more than one terminal and provides power to the load.
The input current of the power supply can be obtained from a grid station, battery, cells, generators, solar cells or another power source.

The 11 volts power supply circuit is created through the use of voltage regulator LM7811 which is its main component that is part of the LM78xx series of regulators and comes in TO220 packaging.
The operation that this ic provides are inner current limiter circuit, overheat shutdown short circuit protection. This power supply is created through the use of very less components and provides an output current of about one amper. Step down transformer is used for voltage step down from 230 volts to 12 volts and it also has a rectifier for rectification of volts

Introduction to LM7811

To have a details understanding of this circuit first of all we have the overview of LM7811.
LM7811 is part of the LM78XX series that has three pinouts and comes in TO-220/D packaging and has fixed output voltage that helps to use in different projects.
Every component of this series comes with inbuilt features like safe area protection, shutdown for high heat current limiter circuits
During operation, they produce some heat if some type of heat sink is employed then it can provide the current at an output of about one amper.
The output of these regulators and the LM78XX series is constant but can be changed through the use of different voltage variable devices.

LM7811 Features

Some features of LM7811 are explained here
It provides the output curent one amper
The IOutput voltage of the LM78XX series is 5, 6, 8, 9, 10, 11, 12, 15, 18, and 24V in this project we will use 7811 which has 11 volts of output
It provides the thermal overloading protection
It also has short-circuit protection and output transistor SOA protection

7811 ABSOLUTE MAXIMUM RATINGS

Features	Symbol	Parameters	Units
Input Voltage (for V = 5V to 18V) (for V 24V	Vi Vi	35 40	V V
Thermal Resistance Junction-Cases	R0JC	5	° C/W
Thermal Resistance Junction-Air	RoJA	65	C/W
Operating Temperature Range	Topr	0 ~ +125 -40 ~ +125	°C °C
Storage Temperature Range	TSTG	-65 ~ +150	C

7811 Block Diagram

11 Volt Power Supply Circuit

Here we will create and discuss the circuit of our project.

Component of Project

The components of the projects are listed here
LM7811 Voltage regulator
Capacitor ceramic and electrolyte
Diode
Step down transformer
Heat Sink
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Circuit Operation

In the circuit, an AC input supply of 230 volts is given to the transformer that is stepped down center tap and provides the fifteen volts and two ampers. The output of the transformer is 12 volts which are given to the bridge circuit through diodes that convert ac to dc or operate the rectification process.
This rectifier dc curent passes through the capacitor having values of 2200uf and 330nf that remove the ripples from the voltages and make pure dc free from noise. The pure dc then passes through regulator LM7811 that regulates voltage and provides 11 volts dc at the output which is our required volts.

There is heatsink is used in the circuit that reduces the heat production in circuitry and saves the circuit from any damage
The voltage obtained from the output can be used for the operation of any device connected to the output of the power supply