If you need, say, a 5V regulator, you grab a 7805, add a capacitor for stability ... The schematic notes you can also replace the IC with an MT2492. With a right-angled header, you can swap ...

We’re quite sure that all hobbyists have used the 7805 voltage regulator at least once in their lives. They are a simple way to regulate 7V+ voltages to the 5V that some of our low power ...