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Steps In PCB Fabrication Process : PCB Manufacturing technique

Updated on September 8, 2010

Printed Circuit Board

PCB DESIGN

Designing of a pcb is a major slip in the production of pcbs. It forms adistinct factor n electronic perfomance and reliability.The productivity of a pcb with assembly and servicability also depends on design.

The lay out should include all the relevant aspects and details of the pcb design while the network might be produced at 1:1 or 2:1 or even 4:1 scale.it is best prepared on a 1:1 scale.


Steps Involved

1. Prepare the required circuit diagram

2. List out the components, their sizes etc.

3. Draft it onto a graph sheet

4. Place all pads and finish thin tracks

5. Put it on the mylor sheet and then on the graph sheet

6. Place parts including screw holes with the help of knife.

7. Fix all the tracks.

8. Keep one component as the key.


Conversion of circuit diagram

1. Cutting lines , Mounting lines are done

2. List all the components their length diameter thickness code names etc.

3. Keep one component as key component

4. Keep key component first and their supporting tools

5. All tracks are straight lines

6. In between ICs no signal lines should be passed

7. Mark the pin number of IC on the lay out for avoiding dislocations

8. The length of the conductor should be as low as possible

9. Place all the components, resistors ,diodes etc. parallel to each other

PCB layout

Lay out approaches

First the board outlines and the connectors are marked on a sheet of paper followed by sketching of the component outlines with connecting point and conductor patterns. Prepare

The layout as viewed from the component side first, so as to avoid any confusion. The layout is developed in the direction of signal flow as far as possible

Among the components the larger ones are filled first and the space between is filled with smaller ones. Components, rewiring input, output connections came near the connectors.

All the components are placed in such a manner that desoldering of the component is not is not necessary, if they have to be re placed. While designing the conductors, the minimum spacing requirement for the final network should be known.

Transforming the lay out to copper

The lay out made on the graph sheet should be redrawn on the copper clad using paint or nail polish.

Etching

The final copper pattern is formed by selective removal of the unwanted copper which is not protected by an electric rebist . FeCl3 solution is popularly used etching solution. FeCl3 powder is made into a solution using water and kept in a plastic tray. Immerse the marked copper clad in this solution for two or three hours. Due to the reaction solution will became weak and it is not recommended for further etching process. Take out the etched sheet from the tray and dry out for in sunlight for an hour.

Etchants

Many factors have to be considered to choose the most suitable etchant system for a PCB process. Some commonly used etchants are FeCl3, Cupric chloride, Chromic acid etc. After etching FeCl3 is washed from the board and cleaned dry. Paint is removed using suitable from the component insertion. Holes are drilled into appropriate position and the components are soldered into PCB carefully

Etching using FeCl3

Practical implementation

Take a copper clad of the required dimensions. Transfer the circuit layout to the copper clad using cotton paper. The layout area should be marked with nail polish. Put the copper clad into FeCl3 solution and warm it. Stage by stage transformation of the copper clad occurs. Warm the solution Intermittently according to the requirement. After about 4 hours etching will be completed. Wash the board using soap solution to remove the remaining of FeCl3 solution. Scrap off the nail polish and drill holes wherever required using appropriate drill bits. PCB is fabricated.

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    • profile image

      Nandni 3 years ago

      tanx for thz kind of steps........it s vry useful 2 us.........

    • profile image

      Dharmesh 3 years ago

      thanks 4 information it helped me a lot in my pcb report..

      thanks

      vinaka...

    • profile image

      abebe techalu 4 years ago

      you are the best information

    • profile image

      sumanth 5 years ago

      good job .. keep it doing helped me a lot

    • profile image

      neha verma 5 years ago

      thanks,its really helpful for me.

    • profile image

      KANWAR NAVEED Ahmad 6 years ago

      Its really helpful.......thanks

    • ayurveda profile image
      Author

      Reeshil N 6 years ago

      @ Shikha

      Download the software 'proteus' you can draw any pcb lay out easily from circuit diagrams.. :)

    • profile image

      shikha 6 years ago

      send the pcb layout of water level detector 8051 based plz..

      ocz i hav d ckt diagram but not the pcb layout to trace on the pcb..

    • profile image

      Othisamy 6 years ago

      Thank you for providing step by step process for PCB Mfg.

    • profile image

      Peter Enmore 7 years ago

      Thanks for the steps on the design of a pcb. Your pictures really helped put it all together for me.

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