This weekly report discusses the progress made by an engineering student on their group project. Specifically: 1) The student designed and built a circuit board, drilling holes and applying coatings, but encountered a short circuit they had to troubleshoot and fix. 2) The circuit uses a microphone, monostable multivibrator, astable multivibrator, and integrated circuit to control an LED display for 15 seconds when sound is detected, then return to default. 3) Strengths included troubleshooting and fixing the problem independently, while delays between circuit boards were noted as a weakness. 4) Next steps are to help another group member with their work and reporting.

1. [INC 281 MULTIDISCIPLINARY WORKSHOP WEEKLY REPORT] May 02, 2012
Name-Surname Charintorn Jareonsri
Student ID. 54261504
Group Name Conthai
rin54261504,tum54261512,golf54261520,chai542615
Engineering
22,dew53219012,golf53211804,banz53211811,champ
Team Members
53211819, june53211831,bank53211833,
Product Design
P’dukdik, P’ake, P’L, P’friend
Team Members
Weekly Progress
This time I made circuit PCB, drilled PCB, PCB coatings and equipment. After that, I have
problems because of a short circuit. I was corrected by measuring and cutting off the circuit. The
circuit can operate.
The principles of the Check Status Power circuit is as follows. First, the microphone receives
sound signals that can trigger the Monostable Multivibator circuit. Monostable Multivibator circuit
to delay the Working for about 15 seconds. Then Astable Multivibrator generates a square wave
signal with a frequency of 1Hz. Signal is converted into a triangle by the Integrated Circuit.
Triangular signal is applied to control the tube LED10 by VU Meter circuit. After 15 seconds, circuit
will stop and return to the default state again.
Figure 1. Check Status Power Circuit Figure 2. PCB circuit
Engineering Analysis
Strong Point
- I know the problem and fix it yourself.
- Monostable Multivibator circuit delay to make flashing light running 15 Seconds and stopped
The circuit can run again when receiving sound signal.
Weak Point
- Problems between the PCB, which causes a delay.
Next Week Job
- Help a friend in the group to work and report.
Department of Control System and Instrumentation Engineering
KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI