Design of a DC Power Supply with Selectable Output Voltages Using Different Regulators for Electronic Lab Prototyping

Abstract

A Direct Current (DC) power supply is an electronic circuit that convert Alternating Current (AC) to Direct Current (DC). The main function of this circuit is to supply Direct Current (DC) electrical power to an electronic device such as lamp, DC motor, phones, laptops etc. This paper discusses the design and simulation of a four output DC power supply circuit using fixed linear voltage regulators to provide 5V, 6V, 9V, and 12V outputs. The objective of this research is to design a four output DC Power Supply circuit which can use for multi-voltage electronic applications. The circuit use LM7805, LM7806, LM7809 and LM7812 voltage regulators to generate the respective output voltages. The design of DC Power Supply circuit was simulated using Proteus software to validate output performance with no load and with load conditions. Simulation results confirmed that each output maintained its designated voltage level with minimal deviation, demonstrating the effectiveness of the design. This project highlights the practical implementation of multiple regulated outputs from a single source, which is essential in prototyping and testing of various electronic devices.