Design and Construction of a Stabilize Variable Power Supply Unit

Abstract

The main objective of this work is to design and construct a stabilize variable power supply unit with a voltage range of 0.20v – 15.85v and current range of 0 – 3Amps (45W) with a very low output impedance of 0.008 ohms. We also study the regulation characteristics of a constructed power supply units to a certain load and line regulation so as to determine its stability by comparing it to a standard power supply unit. Test and analysis were carried out using the constructed power supply unit to power loads (Rheostat) of 126ohms 1A and 11ohms 4A. The major components used include transistors, regulator LM317.The output measurements showed that the power supply was functional and the measured values gave minima variation from the nominal designed values. The developed output power supply is much useful in measurements, laboratory works and general applications requiring power supply.

Keywords: variable power supply unit, impedance, line regulation