The aim of this course is to provide students with knowledge about field effect transistors (FET), their construction, characteristics, basic circuits and simple calculations. In the second part of the course, students will learn about more complex linear devices (operational amplifiers), their characteristics and application. Special attention will be given to lectures concerning circuits based on operational amplifiers, for example: different types of amplifiers, active filters, oscillators, converters and voltage and circuit regulators. Schemes will be given for all circuits, their behavior explained as well as the way of calculating their basic parameters. In the end, the aim is to prepare students for designing basic circuits on their own, considering characteristics of the elements used, and to obtain necessary calculations for this purpose.