DESIGN AND CONSTRUCTION OF REGULATED POWER SUPPLY

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DESIGN AND CONSTRUCTION OF REGULATED POWER SUPPLY

ABSTRACT

This work is on design and construction of regulated power supply . The main objective of this work is to design and develop a stabilized fixed and variable power supply unit (single and dual power supply) with a voltage of 5 V fixed DC , 0.25V – 15.0V variable DC, +12 V & -12V dual power supply and current range of 0 – 1Amps (45W) with a very low output impedance of 0.010ohms with short circuit protection. We also find the load and line regulation characteristics of a constructed power supply so as to determine its stability by comparing it with standard power supply unit. Testing of constructed power supply unit to power loads (Rheostat) of 120ohms 1A and 10ohms 0.5A.The major components used include step down transformers ( Input 230V AC, Output 12V AC, Output 24V AC), 1N4007 Diodes, Capacitors, ICs (7805 IC, 7812 IC, 7912 IC and LM317 IC,) and fixed & Variable resistors i.e. potentiometer, transistors. The developed power supply is tested for its functionality and the measured values are compared with nominal designed values. The designed power supply is much useful in measurements laboratory works and general applications requiring power supply.

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