Electronics is written as a monolog between teacher and student in an attempt to make the language as simple as possible. The various diagrams and oscilloscope plots will help students correlate the theory they learn in the classroom with observations they make in their lab experiments. Thumb rules of circuital designing have been included whereever possible and various laws of physics behind the various devices have been discussed. The chapters in the book can be divided into sections explaining modeling, test equipments and circuital elements which are building blocks of a power supply. Designed as a Textbook for undergraduate students of electronics in physics and engineering, the book hopes to demystify electronics as a subject and encourage beginners to take the next step in circuital designing.