Printed circuit boards, Physics

Assignment Help:

 

INTRODUCTION: A printed circuit board (PCB) IS a sheet of insulating material usually Bakelite with metallic circuitry photo chemically formed upon that material or substrate. On this sheet small holes are given for accommodating the diverse components of the circuit to be assembled. Interconnections between components are achieved by means of conducting paths (metallic conductor pattern) running path or through the substrate is called tracks. Tracks meet components to which they are to be linked through a larger conductor area known as land or pad. The electrical connection between a land and component‘s terminal is achieved by means of a solder joint. Every circuit has its own PCB but the process of manufacturing is more or less the same. First of all the Bakelite sheet of the proper size is taken. The whole sheet is covered with a copper strip on it; the circuit lines are drawn and covered with an enamel layer. After the paint is dried up into solution of ferrite chloride with few drops of hydrochloric acid (HCl). The copper (except the painted portion) is dissolved in the solution later on; this paint is cleaned off by petrol or kerosene. On this copper strip, holes are provided to accommodate the components. To protect from dampness, the copper strips are covered with a layer of varnish.

ADVANTAGES OF PCB: The copper strips over the PCB serve the purpose of the wires hence much wire is saved. Circuit charactistics can be maintained without introducing variation in inter-circuit capacitance. Mass production can be attained at lower cost. Inspection time is decreased as probability of error is removed. As the components are tightly fixed and therefore risk of short circuiting is minimised.

 


Related Discussions:- Printed circuit boards

Electric current, if 36C of charge pass through a wire in 4 seconds what cu...

if 36C of charge pass through a wire in 4 seconds what current is it carrying

Describe the properties of x-rays, (i)  X-rays are electromagnetic waves wi...

(i)  X-rays are electromagnetic waves with wavelength lie among 0.1Å - 100Å. (ii)  X-rays is invisible. (iii) They always go in a straight line with speed of light. (iv) X

State any three uses of ir rays, Q. State any three uses of IR rays. (...

Q. State any three uses of IR rays. (a) Infrared lamps are utilized in physiotherapy. (b) Infrared photographs are utilized in weather forecasting. (c) As infrared radia

Newton''s 2nd Law of Motion, A rocket weighs 9800N. What applied force give...

A rocket weighs 9800N. What applied force gives it a vertical acceleration of 4m/sec/sec?

Particle function, Particle function: Protons The number of proton...

Particle function: Protons The number of protons in an atom determines the kind of material: Eg. Hydrogen 1 proton Helium 2 protons Lithium 3 protons B

Evaluate the tension in the rope, Evaluate the tension in the rope A m...

Evaluate the tension in the rope A muscle builder holds the ends of a masslessrope. At the center of the rope, a 15kg ball is hung. What is the tension in the rope if the angl

Dimensional analysis, if the universal gravitational force depends on the p...

if the universal gravitational force depends on the product of the masses and depends on the distance between the masses ,find an expression for the universal force, and the unit f

Introduce concept about the carbon dioxide laser, Introduce concept about t...

Introduce concept about the carbon dioxide laser. A test target is vaporized and bursts within flame onto irradiation through a high power continuous wave carbon dioxide laser

Second harmonic standing waves on a string, Second Harmonic Standing Waves ...

Second Harmonic Standing Waves on a String There are a variety of patterns that could be generates through vibrations inside a string, slinky, or rope. Each pattern corresponds

Explain squirrel- cage rotor, Explain Squirrel- cage rotor Squirrel- ca...

Explain Squirrel- cage rotor Squirrel- cage rotor having of a slotted laminated core of sheet-steel. The slots of the rotor are not always parallel to the slots on the stator,

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd