This presentation introduces a DC power supply circuit. It is presented by 5 students and contains sections on introduction, how it works, equipment used, circuit diagram, and conclusion. The document explains that AC power is generated and distributed but most electronics require DC. It then outlines the process of how AC power is stepped down by a transformer, rectified by diodes, filtered by a capacitor, and used to power an LED load through a resistor. The equipment used is listed along with images of the components. The circuit diagram shows how the components are connected to convert AC to DC power. In conclusion, the designed power supply provides an affordable alternative to more expensive supplies while keeping the design simple.

1. WELCOME TO OUR
PRESENTATION
DC Power Supply.
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2. PRESENTED BY
Name ID:
1. Rejvi Ahmed 13307132
2. Md. Mostafizur Rahman 13307027
3. Jobaeear Molla 12103097
4. M.A.A.A. Al- Arif Bin Roise 12103055
5. Md. Robiul Islam 13105156
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3. SEQUENCE/CONTENTS
Introduction
How it works
Equipments
Circuit diagram
 Conclusion
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4. Introduction:
The electrical power is almost exclusively generated,
transmitted and distributed in the form of ac
because of economical consideration but for
operation of most of the electronic devices and
circuits, dc supply is required. Dry cells and batteries
can be used for this purpose. No doubt, they have
the advantages of being portable and ripple free but
their voltages are low, they need frequent
replacement and are expensive in comparison to
conventional dc power supplies.
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5. How it Works (Continued):
 Voltage Step down
Process (AC to DC):
The voltage would
down by the
transformer. The
working principle of
transformer is very
simple. It depends
upon Farada’s law ,
mutual induction
between two or
more winding is
responsible for
transformation
action in an electric
transformer.
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6. Rectification Process:
Rectification process
will be accomplished
by using a diode. A
diode is an electrical
component that
conducts current in
one direction and
blocks current from
flowing in the other
direction.
How it Works (Continued):
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7. How it Works (Continued):
 Filtering Process:
For filtering our output
current we may use a
capacitor. A capacitor is
commonly used for
filtering and store
charge in it.
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8. How it Works (Continued):
 Load (LED):
As a load we used LED
light for our project.
LED
Resistor
 Resistor: Resistor is an
electrical component that
reduce the electric
current.
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9. Equipments:
Name: Quantity (Piece)
 Project Board 1
 Transformer 1
 Diode 4
 Resistor 1
 Capacitor 1
 Load (LED Lamp) 1
 Connecting Wire As needed
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10. Equipments at a Glance:
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11. Circuit Diagram
This is the circuit diagram on which the
project would work.
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12. After Completing Project
When AC Power Absent
When AC Power Present
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13. CONCLUSION:
The power supply that has been designed provides a
good alternative to a more expensive
power supply. The power supply has few
components, covers a small area, and is very simple
in design.
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