This document discusses printed circuit boards (PCBs). It provides an introduction and overview of what a PCB is, the need for PCBs, types of PCBs including general, trace, single layer and double layer, and the design process for trace PCBs. It also outlines some advantages like lower costs for mass production and reduced wiring, and disadvantages such as difficulty repairing or redesigning a PCB. Finally, it provides some examples of PCB applications.

1. By
G.SIVA
13A81A0472
E.C.E-B

2. INTRODUCTION
WHAT IS PCB?
WHAT IS THE NEED OF PCB?
TYPES OF PCB
DESIGN OF TRACE PCB
ADVANTAGES
DIS ADVANTAGES
APPLICATIONS

3.  A printed circuit board (PCB) mechanically
supports and electrically connects electronic
components using conductive tracks, pads and other
features etched from copper sheets laminated onto a
non-conductive substrate.
 FR-4 glass epoxy is the primary insulating
substrate upon which the vast majority of
rigid PCBs are produced.
 A PCB populated with electronic components is
called a printed circuit assembly (PCA), printed
circuit board assembly or PCB assembly (PCBA)

4. To make a permanent circuit
To avoid short circuit
To avoid wires
To reduce the cost of circuit
To reduce the size of circuit
To reuse the pcb design
Need of pcb

5. Types of pcb
General pcb
Trace pcb
Single layer pcb
Double layer pcb

6. General Trace
Copper Foil
Laminate
Double trace

7. Design of general pcb

8. Design of trace pcb
Need a layout
Past it to pcb trace
To remove the unwanted copper
Need to drill
Place components and soldering

9.  Stands for Easily Applicable Graphic Layout
Editor
 flexible, expandable and
scriptable EDA application with schematic
capture editor, PCB layout editor, auto-router
 Latest version is 6.1 and minimum
requirements are MAC OS X 10.6, Linux 2.6
and Windows XP.

13. Chemical etching
Chemical etching is usually done with
ammonium per sulfate or ferric chloride.
 In which the board is submerged in etching
solution such as ferric chloride
Solution
 The etching time is long. Heat and agitation can
be applied to the bath to speed the etching rate.

16. Surface-mount technology
Components were mechanically redesigned to have
small metal tabs or end caps that could be soldered
directly onto the PCB surface
Instead of wire leads to pass through holes
Allowing much smaller PCB assemblies with much
higher circuit densities.

18.  The circuit board fabrication cost (pcb cost) is lower with
mass quantity production.
Chances of miss wiring or short-circuited wiring are
minimized.
Component wiring and assembly can be minimized in a
circuit board manufacturing facility.
The location of electronic parts is fixed and so it
simplifies components identification and maintenance of
equipment.
Advantages

19. Re designing is required for the new type
of circuit operation.
Very hard to get repaired if it gets
damaged.
 We can not update it , once printed.
 Etching of this PCB generates chemicals
which are the harmful for the
environment.....
Disadvantages