There are situations when we need variable voltage for example a workbench power supply. No matter how many regulators are invented the 78xx series will always stay cool. Another voltage regulator from the same series which is 7812 I have been using this voltage regulator for powering up a 12v relay and some small DC motors. The maximum of the sensors which are used with the Arduino are low power devices and they can be powered up using the 7805 voltage regulator. I have been using the 7805 voltage regulator for powering up the 8051 family microcontrollers, ATmega328, and sensors that need 5 volts. There are some factors like the 78xx series of regulators give you the fixed voltage. Although we have this much variety of the voltage regulators then why we need the LM317 adjustable regulator? The 78 represents the series while the last two digits represent the voltage. The 78xx series consists of the following regulators The LM78xx series of regulators is quite famous throughout the world and are frequently used in millions of electronics-based projects. I would appreciate your support in this way! I may make a commission if you buy the components through these links. Without any further delay, let’s get started!!! How to make 3.3V, 5V, 12V, and 24V regulated power supplies using the LM317 Regulator.LM317 Power supply circuit diagram and calculations.LM317t price and its Amazon Purchase link.LM317 voltage regulator comparison with 78xx Series of Regulators.This tutorial explains everything you need to know about the LM317 Adjustable Regulator like for example LM317 Adjustable Regulator- In this tutorial, you will learn how to make an adjustable variable voltage power supply based on the LM317 regulator. Variable Voltage using LM317 Regulator:.24V regulated Voltage using LM317 Regulator:.12V regulated Voltage using LM317 Regulator:.LM317 based 5V regulated power supply Proteus Simulation:.5V regulated Voltage using LM317 Regulator:.3.3V regulated voltage using LM317 regulator:.LM317 variable voltage regulator circuit diagram Circuit Diagram:.LM317 adjustable regulator, datasheet specifications:.Suffix S – voltage regulator with TO-263 package. Dissipates 2 W maximum with a 0.5 A current Suffix E – voltage regulator with LLC package. Dissipates 20 W maximum with a 1.5 A current Suffix T – voltage regulator with TO-220 package. Dissipates 2 W maximum with a 0.5 A current Suffix H – voltage regulator with TO-39 package. Suffix K – voltage regulator with TO-3 package. Some regulators of this family include an additional suffix. LM317 operating temperature range: 0 and 125 ☌ LM127 operating temperature range: -25 and 150 ☌ LM117 operating temperature range: -55 and 150 ☌ What is the difference among LM117, LM217, LM317 voltage regulators? A 1N4001 diode (D2) is placed to protect the regulator against possible short circuits in its output when capacitors are discharged.A 1N4001 diode (D1) is placed to protect the regulator against possible short circuits at the regulator input.A 10uF electrolytic capacitor (C2) is placed in parallel with resistor R2, to improve rejection of the ripple voltage. A 1uF tantalum capacitor or a 25uF electrolytic capacitor (C3) is placed at the output terminal (OUT) to improve the transient’s response.A 0.1uF capacitor (C1) is placed at the input terminal (IN), if the voltage regulator is away from the rectification components.In order to optimize the LM317 variable voltage regulator circuit operation, some additional elements can be incorporated into the design. LM317 voltage regulator circuit operation improvement To improve the regulation, resistor R1 must be placed as close as possible to the regulator, while the R2 resistor ground terminal must be connected as close as possible to the ground connection of the load. The I ADJ current was neglected, since it has a maximum value of 100uA, and it remains constant with load and input voltage variations.
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