Adjustable Power Supply Based on LM317T

LM317 3-Terminal Adjustable Regulator

The LM317 device is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V. It requires only two external resistors to set the output voltage. The device features a typical line regulation of 0.01% and typical load regulation of 0.1%. It includes current limiting, thermal overload protection, and safe operating area protection. Overload protection remains functional even if the ADJUST terminal is disconnected.

Features

• Output voltage range adjustable from 1.25 V to 37 V
• Output current greater than 1.5 A
• Internal short-circuit current limiting
• Thermal overload protection
• Output safe-area compensation

Datasheet: https://bit.ly/3jGasNo

After drawing the circuit diagram, I designed and simulated it on Multisim. According to the simulation result, I made the schematic drawing in Altium Designer and edited it by transferring it to the PCB.

What is MultiSIM ?

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NI Multisim (formerly MultiSIM) is an electronic schematic capture and simulation program which is part of a suite of circuit design programs, along with NI Ultiboard.

Multisim is one of the few circuit design programs to employ the original Berkeley SPICE based software simulation. Multisim was originally created by a company named Electronics Workbench Group, which is now a division of National Instruments. Multisim includes microcontroller simulation (formerly known as MultiMCU), as well as integrated import and export features to the printed circuit board layout software in the suite, NI Ultiboard.

Multisim is widely used in academia and industry for circuits education, electronic schematic design and SPICE simulation.

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Establishing the Circuit in Multisim and Displaying the Required Voltage Values and Waveforms with an Oscilloscope

Circuit Diagram Drawn in Altium Designer

Components

Mirrored and Straight Views of Printed Circuitry Drawn in Altium

Straight View

Mirrored View

Final Form of the Scheme to be Engraved on the Plate for the Printed Circuit Board

Straight View

Mirrored View

Since there was no access to the laser printer, the drawing of the schematic was made with an acetate pen on the copper plate and the excess coppers were melted in the prepared HCl & H2O2 solution and the remaining circuit paths were removed, then covered with solder and the components were soldered and the circuit was completed.

Drilling Holes to Place Components

Getting Started to Place and Solder Components

Components Placed and Soldered

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