Day 5

Common lecture- EAGLE CAD

Sometimes for your project you find a new component for which a suitable library does not exist. Then what do you do? Create your own library. Yes, this lecture was about creating your own library in Eagle.

Creating a new library is a simple and engaging process. A representative symbol of the component is created followed by designing of an appropriate package using the dimensions given in the datasheet (or sometimes dimensions have to be measured using a vernier callipers and screw gauge). Then the pins on the symbol are mapped on to the pins of the package to create the new device.

Fabrication

After the lunch break the participants got an opportunity to learn the nitty-gritties of fabricating a printed circuited board (PCB).

The board layout for the code practice oscillator (CPO) circuit was prepared by the participants themselves. The schematic and board layout were then verified by their mentors before the commencement of the fabrication process.

The entire fabrication process took 3 days for completion which involved several steps as listed below:

  1. Printing the board layout on a glossy paper
  2. Preparing the surface of the copper clad board using a sand paper to remove the oxide layer which is non- conducting and has been deposited over time.
  3. Transferring the ink by pressing: The toner transfer method.
  4. Removing paper by washing.
  5. Etching the copper clad by using FeCl3 solution so as to remove the excess copper.
  6. Scrubbing off the ink to expose copper tracks.
  7. Using Acrylic spray film to prevent formation of copper oxide.
  8. Filing out the projections on the edges.
  9. Soldering the components on the PCB.
  10. Testing the PCB.

By the end of the day many participants had completed their boards till the drilling process.

Fabrication Process

Overview of the steps involved in DIY PCB Fabrication

Etching

Participant involved in etching process

PCB after scrubbing

PCB after scrubbing

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