1) DC Regulated Power Supply, AC/DC Power Supply, Step Down Transformer (AC Supply) 2) Function Generator, RF Signal Generators & General Measuring Instruments 3) Battery Eliminators & Batter Chargers 4) Resistance Boxes & Post Office Boxes, Carry Forster Bridge, Wheat Stone Bridges 5) Resistance in Parallel & Series, Ohms Law, Stefan's Law 6) Decade Capacitance Box, Decade Inductance Box 7) PN Junction Diode, ZENER Diode, Transistor (PNP /NPN) Characteristic Apparatus