variable power supply

2. VARIABLE DC POWER
SUPPLY
Presented by:
JAVAID MUSA

3. AGENDA
INTRODUCTION
PROCEDURE ANALYSIS
COMPONENTS
CIRCUIT DIAGRAM
FUTURE SCOPE OF THE PROJECT
FUTURE PLAN
CONCLUSION

4. INTRODUCTION
4
A variable dc power supply is also known as adjustable dc power supply.
That allows the users to easily adjust the output voltage and current trough
potentiometer.
It is a simple variable dc power supply which gives (0 to 30dc volts)
approximately as an output.

5. PROCEDURE ANALYSIS

6. COMPONENTS
1) Transformer center tapped 12x2
2) Bridge rectifier
3) Capacitor 1000uf
4) Potentiometer 10k
5) Lm 317 t voltage regulator
6) Heatsink
7) PCB
8) chassis

7. CIRCUIT DIAGRAM

8. CIRCUIT TESTING

9. LM 317T VOLTAGE REGULATOR
• This monolithic integrated circuit is an adjustable 3-
terminal positive voltage regulator designed to
supply more than 1.5 A of load current with an
output voltage adjustable over a 1.2 V to 37 V. It
employs internal current limiting thermal
shut-down and safe area compensation.

10. BRIDGE RECTIFIERS
• Bridge rectifiers are circuits that convert alternating
current(AC) into direct current(DC) using diodes
arranged in the bridge circuit configuration. Bridge
rectifiers typically comprise of four or more diodes.
The output wave generated is of the same polarity
irrespective of the polarity at the input.

11. FUTURE SCOPE OF THE PROJECT
LM 317 has many future prospects. By using LM 317 we can easily
overcome the noise effect of the circuit and by changing the load
resistance and voltage the noise effect can further be diminished. So that
we get an error free output voltage. In other words LM 317 is highly
proficient in making a circuit error free and flawless.

12. FUTURE PLAN
 Increased Power Output
 Enhanced Efficiency
 Advanced Control and Regulation
 Multi-Channel Outputs
 Improved Portability and Compactness

13. CONCLUSION
LM317 is a very useful integrated circuit used in power
supplies. But when capacitor and protective diodes are
included in the circuit, it acts a protective circuit,
protecting the highly complicate circuits from being
damaged.

14. DC POWER SUPPLY 14