An electric device which provides a constant DC voltage of a predetermined value to the load terminal of a regulated power supply regardless of load variation and AC main fluctuations. In this project work 5volt DC regulated power supply and 30volt variable DC regulated power supply are made. For 5volt DC regulated power supply it was first constructed on bread board and tested it on PCB afterward and giving regulation. Current regulation of 0 to 0.5 ampere and voltage regulation of 0 to 5 volt obtained. For designing of 30volt DC regulated variable power supply directly tested on PCB and obtained voltage regulation of 0 to 30 volt and current regulation of 0 to 5 ampere. Overall both supply are tested and found ok for various requirement of energy source in which a quality DC regulated power can be obtained.