How PCB is usefull?

Answer 1

A printed circuit board, or PCB, is used to mechanically support and electrically connect electronic components using conductive pathways, tracks or signal traces etched from copper sheets laminated onto a non-conductive substrate.

Printed circuit boards are typically made with copper. Depending on the requirements, the copper is plated to a substrate and carved away to expose the design of the board. Since there are multiple layers, they must be lined up and bonded together for a secure fit.

PCB Manufacture Process

Step 1 – The Design Before you begin manufacturing the PCB, you need to have a design of the board. These blueprints will be what you base the process off of. .

Step 2 – Print the Design

A Special printer called a plotted printer is used to print the design of the PCB. It produces a film that shows the details and layers of the board. When printed, there will be two ink colors used on the inside layer of the board:

Step 3 – Creating the Substrate Now is when the PCB will start to form. The substrate, which is the insulating material (epoxy resin and glass fiber) that holds the components on the structure.

Step 4 – Printing the Inner Layers The design is printed to a laminate, the body of the structure.

Step 5 – Ultraviolet Light Once aligned, the resist and laminate go under ultraviolet lights to harden the photoresist. The light reveals the pathways of copper. T

Step 6 – Removing Unwanted Copper Now, it is time to remove any unwanted copper that remained on the board. A chemical solution, similar to the alkaline solution, eats away at the unwanted copper.

Step 7 – Inspection The newly-cleaned layers will need to be inspected for alignment. The holes drilled earlier help align the inner and outer layers. An optical punch machine drills a pin through the holes to keep the layers lined up.

Step 8 – Laminating the Layers Now, you will see the board take shape as the layers are fused together. Metal clamps hold the layers together as the laminating process begins.

Step 9 – Pressing the Layers A mechanical press is then used to press the layers together.

Step 10 – Drilling Holes are drilled into the layers by a computer-guided drill to expose the substrate and inner panels. Any remaining copper after this step is removed.

Step 11 – Plating The board is now ready to be plated. A chemical solution fuses all of the layers together.

Step 12– Etching The same chemical solution from before removes any unwanted copper under the resist layer. The tin guard layer protects the needed copper. This step established the PCB’s connections.

Step 13 – Solder Mask Application All of the panels should be cleaned before the solder mask is applied. An epoxy is applied with the solder mask film.

Step 14 – Silkscreening Silkscreening is a vital step since this process is what prints critical information onto the board. Once applied, the PCB passes through one last coating and curing process.

Step 15 – Surface Finish The PCB is plated with either a solderable finish, depending on the requirements, which will increase the quality/bond of the solder.

Step 16– Testing Before the PCB is considered complete, a technician will perform an electrical test on the board. This will confirm the Printed Circuit Board (PCB) functions and follows the original blueprint designs.

Answer 2

Printed Circuit board is very useful in connecting all active and passive components in a diciplined manner to detect any fault in future