MINOR PROJECT WORK REPORT ON REGULATED POWER SUPPLY Submitted to State Board of Technical Education For the partial fulfillment of the requirement for the award Of diploma of Electronics and Communication Engineering for the SESSION: 2008 TO 2011 Submitted by : - Submitted to :- Rajat Aggarwal Mr. Chanan Pawar 0809810040 Sr. Lecturer Electronics & Comm. Poonam Mehta Engineering 0809810033
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MINOR PROJECT WORKREPORT
ONREGULATED POWER SUPPLY
Submitted to State Board of Technical Education
For the partial fulfillment of the requirement for the award
Of diploma of Electronics and Communication Engineering
for the
SESSION: 2008 TO 2011
Submitted by: - Submitted to:-
Rajat Aggarwal Mr. Chanan Pawar
0809810040 Sr. Lecturer
Electronics & Comm. Poonam Mehta Engineering
0809810033
Manisha
0809810023
ACKNOWLEDGEMENT
We are deeply indebted to “ Mr. Chanan Pawar Sr. Lecturer in Department of Electronics & Communication Engg. at Ambition Institute Of Polytechnic , Moriwala (Sirsa)”. For his inspiring and encouraging guidance without which this project work could not have been completed inspite of his busy schedule. He always had time to attend the problem faced by us in our project work. We will always remember his quick analysis, comprehensive solution and critical reviews, he has been given through out the project work.Cordial and earnest thanks to staff of Ambition Institute of Polytechnic, Moriwala (Sirsa) for his valuable suggestion and help remembered in conducting the project work.But at last, but not least we express over indebtedness to our parents and all other family members for their patience and help extended in this end over.
Rajat Aggarwal0809810040
Poonam Mehta0809810033
Manisha0809810023
Ambition Institute of PolytechnicMoriwala (Sirsa)
CONTENTS CHAPTER-1 INTRODUCTION
o Introduction.
o Theoretical background
o Aim to design this project
o Application
o Advantages
CHAPTER-2 PROJECT DESCRIPTIONo block diagram
o block description
o circuit diagram
o circuit description
o component used
o working principle and operation
CHAPTER-3 FABRICATION PROCESSo fabrication techniques
o various tools and equipment
o soldering
o tips and tricks
o precautions
CHAPTER-4 TESTING CHAPTER 5 RESULT AND CONCLUSION Reference
Chapter:-1
INTRODUCTION
INTRODUCTIONRegulated power supply
In general, electronic circuit using transistors require a source
of DC power for example in tube amplifiers, DC voltage is
needed for plate, screen grid and control grid. Similarly the
emitter and collector bias in a transistor must also be direct
current. Batteries are rarely used for this purpose as they are
costly. In practice DC power for electronic circuit is most
conveniently obtained from commercial AC lines by using
rectifier-filter system, called a DC power supply. The rectifier-
filter combination constitutes an ordinary DC power supply.
The DC voltage from an ordinary power supply remains
constant. So long as AC mains voltage or load is unaltered.
However, in many electronic applications, it is desired that DC
voltage should remain constant irrespective of change in AC
mains or load under such situations, voltage regulating devices
are used with ordinary power supply. This constitutes
regulated DC power supply and keeps the DC voltage at fairly
constant value.
CERTIFICATECertify that the project entitled “variable regulated power
supply” submitted by Rajat Aggarwal 0809810040, Poonam
Mehta 0809810033 and Manisha 0809810023 in partial
fulfillment of the requirement for the award of “Diploma in
Electronics & Communication Engg. by the state board of
Technical Education Punjab Panchkula” is a record student
own project work carried out under my supervision.
Er. Chanan Singh Pawar
Electronics & Comm. Engg.
Ambition Institute of Poly.
Moriwala (Sirsa)
Ambition Institute of PolytechnicMoriwala (Sirsa)
Chapter:-2
PROJECT
DESCRIPTION
BLOCK DESCRIPTIONTransformer: - The low voltage AC output is suitable for lamps,
heaters and special AC motors. It is not suitable for electronic circuits
unless they include a rectifier and a smoothing capacitor.
Transformer + Rectifier: - The varying DC output is suitable for
lamps, heaters and standard motors. It is not suitable for electronic
circuits unless they include a smoothing capacitor.
Transformer + Rectifier + Smoothing: - The smooth DC output
has a small ripple. It is suitable for most electronic circuits.
Transformer + Rectifier + Smoothing + Regulator: - The
regulated DC output is very smooth with no ripple. It is suitable for all
electronic circuits.
CIRCUIT DISCRIPTIONStep Down Transformer :- Transformers convert AC electricity
from one voltage to another with little loss of power.
Transformers work only with AC and this is one of the reasons