The weekly report summarizes the progress of a student group working on a product design. The student was assigned to design the power supply and developed a circuit using IC regulators to produce 5V, 9V, 12V and 4.5V outputs from the input voltage. Their power supply design uses IC7805, IC7809 and a voltage regulator to achieve the desired voltages. Next steps are to design the voltage regulation circuit and further study the LM317 datasheet for the 4.5V output.

1. [INC 281 MULTIDISCIPLINARY WORKSHOP WEEKLY REPORT] March 14, 2012
Name-Surname
Student ID. 53211812
Group Name KID - WA
Engineering Care, Fond, Ple, Nack, Pop, Dish, Lek,
Team Members P’Aote, P’Bell
Product Design
P’Tong, P’Gong, P’Alu, P’Joy
Team Members
Weekly Progress
I was assigned responsibility power supply. A power supply is a device that supplies
electrical energy to one or more electric loads. The term is most commonly applied to devices that
convert one form of electrical energy to another, though it may also refer to devices that convert
another form of energy (e.g., mechanical, chemical, solar) to electrical energy. A regulated power
supply is one that controls the output voltage or current to a specific value; the controlled value is
held nearly constant despite variations in either load current or the voltage supplied by the power
supply's energy source.
This device have 5V 9V 12V and 4.5V. Which 5V be used IC7805, 9V be used IC7809,
and 12V get by circuit IC7809. Circuit use a DC circuit get by brigde regulator. And 4.5V get
by LM317.
Figure 1.
Figure 2.
Engineering Analysis
Strong Point
Voltage can find IC a Voltage meet the requirement.
Week Point
The study datasheet of LM317 for 4.5V or 4.8V.
Next Week Job
Design circuit for voltage.
KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI