HowTo Make Variable Power Supply Using LM317

 How to make variable power supply using lm317 |

#newvideo2021 #newvideo #voltageregulator #variablepowersupply #diy #lm317 #bd139 #tip3055

This Project is to make a simple variable Power supply in LOW cost.

Mager Components

LM317-:

The LM317 is an adjustable 3-terminal positive voltage regulator capable of supplying different DC voltage outputs other than the fixed voltage power supply of +5 or +12 volts or as a variable output voltage from a few volts up to some maximum value all with currents of about 1.5 amperes.

BD139 Transistor:-

BD139 is an NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at the ground and will be closed (Forward biased) when a signal is provided to the base pin BD139 has a gain value of 40 to 160, this value determines the amplification capacity of the transistor. The maximum amount of current that could flow through the Collector pin is 1.5A, hence we cannot connect loads that consume more than 1.5A using this transistor. To bias a transistor we have to supply current to the base pin, this current (IB) should be limited to 1/10th of the collector current, and the voltage across the base-emitter pin should be 5V maximum. age.

PINOUT:-

Emitter:- Current Drains out through emitter, normally connected to ground Collector:- Current flows in through collector, normally connected to load Base:- Controls the biasing of the transistor, Used to turn ON or OFF the transistor.

Features:- Plastic casing NPN Transistor Continuous Collector current (IC) is 1.5A Collector-Emitter voltage (VCE) is 80 V Collector-Base voltage (VCB) is 80V Base Current (Ib) is 0.5A Emitter Base Breakdown Voltage (VBE) is 5V DC current gain (hFE) is 40 to 160

More Details: Complete Technical Details can be found at the BD139 transistor datasheet

TIP3055:-

TIP3055 is a three-layer NPN device within the working range, the collector current IC is a function of the base current IB, a change in the base current giving a corresponding amplified change in the collector current for a given collector-emitter voltage VCE.

Features:-

Low saturation voltage

Simple drive requirements

The high safe operating area

For low distortion complementary designs

Easy to carry and handle

Transistor Polarity NPN

Collector−Emitter Voltage (VCEO) 60V

Collector−Base Voltage (VCBO) 7V

Continuous Collector Current (Ic) 15A

Continuous Base Current (Ib) 7A

Emitter Base Voltage (VEBO) 1.8V

Power Dissipation (Pd) 90W

Operating Temperature Range -65 - 150°C

DC Current Gain (hFE) 20-70

More Details: Complete Technical Details can be found at the TIP3055 transistor datasheet

Tutorial Video:-

Required Components:- 1× Zaro PCB 4× 1N4007 Diode 1× 1000uf 50v Capacitor 1× LM317 Volatage regulator 1× 220 ohm resistor 1× 5k potentiometer 1× 10k potentiometer 1× BD139 Transistor 2× TIP3055(or MJE3055 or 2N3055) 2× Heatsink 2× 1 ohm 5w resistor 

2× 2 pin PCB mount terminal block    

Circuit Diagram:-  

   

 Schematic:-

    

Code, Circuit Diagram Download Link:- https://drive.google.com/drive/folders/1O_60CSdK2t1oYi2F-39S0bn6ajjwTior?usp=sharing

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