Variable Power Supply Using Lm317 Pdf

It is a robust reliable and easy to use variable dc power supply.

Variable power supply using lm317 pdf.

0 28v 6 8a power supply circuit diagram using lm317 and 2n3055 this design can produce a current of 20 amps with little modification use proper rating transformer and a huge heat sink with a fan. The picture above is the circuit diagram of the power supply. This circuit may be what you re looking for. It is ideal for those who want to adjust voltage from 1 25v to 30v and currents up to 1a.

It is actually very similar to most of the lm317 based power supply with some key difference. Instead of using batteries which have a limited lifetime a variable dc power supply can be used which is implemented in this project. I have few doubts in protection diode using in lm317 if we use protection diode d1 d2 in lm317 it will protect the o p short circuit if vout short circuit to gnd what happen to ic ic will damage or not in our college lab many varaible power supply damages due to o p short circuit so by using protection diode in lm317 it will help. For example it is a power supply instead of a one 1 5v aa battery.

With the advent of chips or ics like lm317 l200 lm338 lm723 configuring power supply circuits with variable voltage output with the above exceptional qualities has become very easy nowadays. A transformer is used to step down the ac supply to 24v at 2a. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. How to use lm317 for producing a variable output.

Variable power supply using lm317 1 2v to 30v at 1a. The above universal power supply circuit provides a variable voltage between 3 to 30v the maximum current of 1 5a and addition of modules can provide a higher current. The adjustable voltage regulator lm317 u1 offers short circuit. The working of the circuit is as follows.

The huge heat sink is required in this circuit as 2n3055 transistors produce a large amount of heat at full load. Which is sufficient for normal use. One of them is the extra pair of 470 uf capacitor and 1n4007 diodes below the main bridge rectifier. This ic is normally available in to 220 package and.

It is a charge pump circuit used to create a low power negative dc voltage source. The universal power supply must operate from ac line voltage ranging from 90 to 264v. Lm317 d lm317 ncv317 voltage regulator adjustable output positive 1 5 a the lm317 is an adjustable 3 terminal positive voltage regulator capable of supplying in excess of 1 5 a over an output voltage range of 1 2 v to 37 v. The price you deny difficult.

Here we ll try to understand how to construct a simplest power supply circuit using the ic lm317.