May 17, 2009

What are Printed circuit Board (PCB)

A printed circuit board abbreviated as PCB, is a piece of Bakelite insulating board. It defines all details of the circuit & partly also the final equipment. One side or both side of PCB is covered by the copper or silver layer. The metallic conductive path serves as a conducting path for the electronic components, which are mounted on the other side of PCB.

Printed board are exclusively used for assembling electronic circuit due to its advantages, which are given below:-
1. Easy adaptability to manufacture & modular design.
2. Provide uniformity in production.
3. Lower cost.
4. Virtually eliminate wiring errors & complexity.
5. Minimize assembly & inspection time.

Types of PCB’s
Some popular PCB type are usually used in electronic applications, which are mentioned below:-

1.Single sided PCB:-
The single sided PCB’s are mostly used where manufacturing cot have to be kept of minimum. To jump over conductor tracks, components have to be utilized if this is not feasible, jumper wires are restricted economic reason.

2.Flexible PCB:-
Flexible PCB’s mainly used in military & aero space applications but now they are incorporated in many other fields like computers, industry etc. This may have the function of board ness or similar to a single PCB or a combination of both.

3.Metal core PCB:-
In metal core boards, the typical resin or fuller laminate of ordinary PCB is replaced by sheets or metal covered with insulating material.

Material of PCB:-
The number of different printed board material in common use in finite, the problem of material selection & quality control are always arises. A laminate can be obtained by pressing layers of fillers material impregnated wit resin under heat & pressure. The basic required material of copper-laid boards are-fillers, resin & copper foils.
eg:-FR-4, the most common PCB material,FR-2,
Polytetrafluoroethylene (Teflon) etc.


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