The aim of this book is to understand: Passive devices, Resistors, Capacitors and Inductors. Semiconductor Diodes and its uses. Zener Diode and its applications. Special types of Diodes. Transistors - Bipolar, Testing and Applications. Transistor - Field Effect and its uses. SCR, UJT, Diac, Triac. ICs analogue and digital precautions while handling and testing. Regulated power supply. DC-DC Converter and Filter Circuit.