Week 6 FYP II

Title of activity: 

Fabrication of PCB.


Objectives: 


1. To study the method for fabrication.
2. To present the result of fabrication.


Procedure:


1. PCB drawing: is designed by Protel DXP 2005. Once all the drawing was confirmed, it is now ready for print out. Print the layout on the A4 size transparent OHP paper. 


2. Tools required:

• Fluorescent light
• UV PCB 
• Marker pen
• Blade 
• OHP transparent paper
• Iron (III) Chloride FeCl₃ acid.
• Clean water
• Thinner
• Plastic container 
• Laser printer
• PCB cutter and trimmer 

3. PCB cutting: Cut photo PCB size according to the film size.

Cut the film PCB according to size

Cut the OHP paper according to PCB size

4.  PCB Photo Etching: Expose the photo PCB in photo etching kit for 8-10minutes.

Etching kit

Exposing the photo PCB in 8-10 minutes.

5.   PCB Developing: Wash the PCB using PCB developer (white powder) for 2 minutes.

6. Acid Etching:

• print image on PCB copper board
• prepare the iron (III) chloride solution
• add in hot water
• shake the water until see unused part is washed and left only the tracks. 

The concentration of iron (III) chloride will determine rate of chemical reaction. In this etching process, the chemical reaction involve in the etch process is:

     FeCl₃ + Cu ® FeCl₂ + CuCl

Where FeCl₃ is the iron (III) chloride, Cu is copper, FeCl₂ is iron (II) chloride and CuCl is a copper chloride.

PCB copper board with iron (III) chloride.

After etching

7. Thinner Washing: This is a process to remove the black ink on the PCB board. The black ink has to be removed in order to solder the components. The green coating on PCB can be removed by alcoholic solution and leaving only the PCB trace. After remove the black ink, the PCB is then send for cleaning using normal water.

8. Drilling: Drill PCB after alcohol washing, use drill bit 0.8mm, 1.0mm and 1.2mm.

9. Final result:

Conclusion: 

    We already done with the printed PCB board. Next is to assemble all the component on breadboard, and PCB board!