The controlled flow of electrons has been used through various techniques and forms what’s known as electronics. Besides the common electronic gadgets such as radio and TV receivers, audio and video tape recorder, frequency synthesizer, calculators, cameras, musical doorbells, etc. electronics has offered it is services in different walks of life. Computer, which has revolutionized the world, is one of the major achievements of electronics Reliability and precision are the two key factors in medical diagnostics and treatments, in laboratory practice and industrial operation. In medical diagnostics and surgery, all scanning devices and techniques use electronics in some form or the other . . The term ‘electronics’ has been coined from electron-the key particle, flow of which through a conductor gives us electric current or simply current. This current can be produced with the help of batteries and generators-machines which generate electric power either dc or ac at 50 Hz. This current can be put to use for various purpose such as illumination, heating, driving the motors. The generation, control, transmission and use of both dc and ac at 50 Hz magnitudes ranging from a few microamperes to hundreds of ampere are coming under the purview of therefore called electrical engineering. However electronics has far reaching capabilities and potentialities. The flow of electrons has been regulated and controlled in electronic devices under the stimuli of external influences, which may be called signal, message, data or any other name appropriate for the occasion. The controlled flow of electrons has been used through various techniques and forms what’s known as electronics. In modern times, it is very difficult to find any thing starting from household goods, transports, health, communication, entertainment, multimedia, internets, where electronics hasn’t made it is presence felt .