In this entry, I will explain that there are few steps for the PCB fabrication.
1. PCB Cutting
- cut photo PCB size according to the film size
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| PCB layout design |
2. PCB Photo Etching
- Expose the photo PCB in photo etching kit for 8-10 minutes.
- the board needs to be exposed to ultra-violet light, using UV exposure.
- UV exposure units can easily be made using standard fluorescent lamp ballasts and UV tubes.
- wash the PCB using PCB developer (white powder) for 2 minutes.
4. Acid Etching
- etching is a process that removes materials from such as unwanted copper from the PCB surface to achieve circuit design requirements. The etching process used in this project is called chemical etch or pattern etch.
- Once the image printed on PCB copper board, there is a iron(I III) chloride solution and ready to the etching.
- the etching process takes around 30 minutes.
5. Thinner Washing
- this is a process to remove the black ink on the PCB board. The black ink has to remove 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.
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| After the etching process is done |
For the next entry, I will explain show the drilling process.