1. Chapter one deals with basic diode circuit theory and its application in device formation. 2. Chapter two gives a brief introduction to bipolar junction transistors and their uses in three different configurations. 3. Chapter three explains field-effect transistors and their performance in different modes with applications. 4. In chapter four, feedback amplifiers give complete information about feedback network, oscillator and their applications. 5. Chapter five explains basic and advanced theories about operational amplifier and their application in negative and positive feedback modes.