The most simplest approach to a hobbyist voltage regulator is to use 78XX series voltage regulator IC's to build one. Lets get into the task of building a simple 5V regulator using 7805. It is always intelligent to look into the datasheet of the IC before using one. Mar 23, 2019 · The voltage regulator IC 7805 is actually a member of the 78xx series of voltage regulator ICs. It is a fixed linear voltage regulator. The xx present in 78xx represents the value of the fixed output voltage that the particular IC provides. For 7805 IC, it is +5V DC regulated power supply. This regulator IC also adds a provision for a heat sink. 78xx (sometimes L78xx, LM78xx, MC78xx ...) is a family of self-contained fixed linear voltage regulator integrated circuits. The 78xx family is commonly used in electronic circuits requiring a regulated power supply due to their ease-of-use and low cost.