LM338 Variable Power Supply Circuit

Hello, readers welcome to the new post. Today we will discuss LM338 Variable Power Supply Circuit. In electronic engineering, every circuit and device works on power. Each module needed different values of power to work on different types of power sources devices are working that provide the different values of volts to operate the devices.

Here we will use the voltage regulator LM338 for power supply creation. There are different PCB suppliers working in the universe but for the creation of our project, we are using the board services by the PCBWAY. PCBWAY is china based PCB supplier that is offering different services based on PCB and related projects. They are equipped with professional engineers and high-level machines to make your projects and design circuits. PCBWAY is considered the all-in-one option for PCB prototypes order and PCB assembly.PCBWAY is the one platform where PCB board fabrication with different features and requirements as well PCBA services are also offered. Through PCBWAY you can get the PCBA services there to specialize in prototyping and small batch PCB assembly at fewer prices than the other manufacturer.

PCBWAY is offering the best prices in just 5$ you can get ten pieces of one to two layers boards in just twenty-four hours and in 30$ you can get 1 to 20 Pieces with free shipping. With that PCBA prices are starting from 88$ to get ten pieces and the price per component is 0.1$ to 0.3$. BGA mounted, MIcro BGA leads less packaging and QFN are considered as difficult products for PCBA and some other manufacturers hesitate to make these projects while PCBWAY is best in this features like others and has the ability to create these products without any problems and also has the ability to handle the BGA having dimension 0.25mm pitch through X-RAY testing.

Here some features of PCBWAY PCBA are listed that will helps you to make Projects from PCBWAY.

BGA Assembly
Through Hole Assembly
SMT Assembly
Mixed Assembly
Rigid Flex PCB Assembly
With that PCB board creation, PCBWAY also offers outsourcing services for your PCB parts that are called Turn Key services. Here some boards requirements to get the PCB assembly
Minimum Board dimensions are 50mm by 100mm
Maximum board dimensions are 250mm by 500mm

So let’s get started LM338 Variable Power Supply Circuit

Table of Contents

Introduction to LM338

The LM338 is a variable DC power supply component and for volts range from 1.2 to thirty volts

It has the ability to handle a load of five to ten amperes. As compared to other power supply circuits like LM217 it has a larger value of current value
It comes in three pinout configuration adjust, output and input.
It comes with a line regulation value of 0.1 percent
it used for thermal regulation
Its line regulation value is 0.005 percent per volts
It has a current value limited to temperature
It used to protect the circuit from short circuit fault

Components of Project

The component used in the project is explained here. The schematic of the projects is drawn by the PCBWAY designer on the PCB board. I send the Gerber file to get the board configuration with reasonable prices and great accuracy

- Capacitor 1 has a capacitance of ten micro Farad
- Capacitor 2 has 4.7 micro Farad
- Resistance Rx of one twenty ohm value
- Two diodes denoted as Dx and Dy of 1N4007 nature
- One variable resistance is used of one-kilo ohm value
- PCB Board from PCBWAY
A diode is an electronic component that converts alternating current to direct current through a rectification process and allows current to flow in one direction only.
The operation of a diode is similar to that of a check valve which allows liquid to flow in one direction only, similarly current flows through a diode in only one direction
The diode is made of a combination of two different semiconductor materials P and N.
The P side of the semiconductor is positive and is called the anode, and the N side of the diode is negative and is called the anode.
Because of the high-temperature bears, silicon is used in diode construction, but germanium is also used to make diodes when less voltage drop is needed.

LM338 Variable Power Supply Working

The main component of this project is the variable voltage regulator LM338 which has three pinouts. Its pinout no 1 is attached to the variable resistors and another terminal of variable resistances linked to the ground. The value of potential resistance helps to set the value of output
The variable voltage supply that can be regulated from 1.5 volts to thirty-five volts is linked to pin no 3 of the LM338 regulator.
Pin 2 of voltage regulator LM338 linked ot the output part of the circuitry.
In the circuit, there are two diodes dented as Dx and Dy are used for the rectification process as will do the reverse protection of components used in the circuits.

Two capacitors are used in the circuit for removing the ripples existing in the output to make the pure volts without any spikes.
Capacitor 1 is used as a bypass capacitor and capacitor 2 is used to show the output.
Pure supply is given at capacitor 2 used for operating the devices in the range of 1.2 to thirty-two volts since at output we provided the 1.5 to thirty-five volts
All these components are assembled on the PCB board created from the PCBWAY to make regulated power supply