The document is a weekly report from a student group working on a product design. It details the student's work on designing a power supply that week. The student was assigned to design the power supply and reports it will provide 5V, 9V, 12V, and 4.5V voltages using various integrated circuits. Figures 1 and 2 show circuit diagrams but are not described. The positive aspect is different voltages can be obtained using appropriate ICs. The weakness is needing to further study the datasheet for the LM317 IC to obtain the precise 4.5V voltage. The next steps are to design the voltage regulation circuits.

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