The wonder chip microprocessor has been the most fantastic development of the recent years. No other single development has affected our lives as much as the microprocessor in such a short time. Its ever-increasing applications have resulted in developments which were simply unheard of till a few years ago. The emergence of various programmable logic devices of modern electronic systems in industry rarely uses conventional manual techniques. Instead, computer aided tools are used. But this has not made the basic concepts and the manual techniques of digital theory and practice obsolete. Rather, the manual techniques are the foundation of CAD tools and they provide a clear insight into the Cad tools. Therefore, it is very essential to have a strong foundation of the basic electronics techniques for making effective use of automation in design.
The electronic devices which we use in our daily life are known as consumer electronic goods, without them we cannot dream a life now days; these devices are used for communication, entertainment, and for work etc. The devices used are personal computers, MP3 players, walkmans, audio system, television, telephones(mobile phones), GPS automotive navigation system, sound recorders, washing machines, DVD players, camcorders etc. The global consumer electronic industry is ruled by companies like Sony, Toshiba, Philips, Samsung, LG, Panasonic, Apple, Microsoft; they countries which are known as hub of these items are Japan, Korea, China etc.

All the electronic devices are either made of analog circuits or digital circuits,

Analog Circuits: Analog circuit system involves continuous range of voltage, a simple radio or radio waves receivers are constructed using a series or combination of few basic types of analog circuits. They are also known as linear circuits, there are various modulation and mixing techniques are also used which comes under non-linearity terms, the common analog circuits carry vacuum tubes, oscillators and operational amplifiers within them.

Digital Circuits: The voltage level is discrete in digital circuits; the common devices which work on principles of digital electronics are computers, programmable controllers, electronic clock, etc. The building blocks of the digital circuits are logic gates, flip-flops, adders, encoders, decoders, registers, counters, microprocessor, microcontrollers.

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