CHAPTER 4 PCB MANUFACTURING

4.1 INTRODUCTION

PCB means printed circuit board PCB is one of the most important elements in any electronic system. They accomplish the interconnection the between component mounted on them in particular manner PCB consist of conductive circuit pattern which is applied to one or both sided of an insulating base copper is most widely used for conductor material. Aluminium nickel, silver, brass is used for same special application. The thickness of conducting material depends upon the current carrying capacity of circuit. Thus a thicker conductor layer will have mare current carrying capacity once the PCB is manufactured the current carrying capacity is depends on which of conductor track. 

4.2 FUNCTIONS OF PCB

The printed circuit board usually serves there distinct functions are as follows:

• It provides mechanical support for the component mounted on it.

• It provides necessary electrical interconnections.

• It acts as a heat sink i.e. it provides a conduction path leading to removal of most of the heat generate in the circuit.

4.3 ADVANTAGE OF PCB

Over the conventional wire method

: 1. PCB‟s have controllable and predicable electrical mechanical properties.

2. Rapid production is possible.

3. Time is saved since it avoids wiring connections production to another

4. Weight is reduced 20

5. Soldering is done in one operation instead of individual connection between component and wires.

6. Cost is less 

4.4 TYPES PCB 

A) Single Sided PCB: This type of PCB consists of a natural coil of a copper on only one side of the base material. This type of PCB frequently used when the manufacturing cost has to be kept at minimum.

B) Double Sided PCB: Double sided PCB is used when there is more number of jumpers. This type of PCB has copper fail on both side of base material. The double-sided PCB‟s are used when insulation of PCB is very complicated i.e. if jumpers are more in number and when it is difficult to fabricants the PCB ON a single sided PCb 

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