Here are two DC power supply protection circuits. The 3-pin regulator 7800 series gets popular. I also like it. Because it is convenient and affordable.
This is increasing output voltage 78xx using diode, is a fixed voltage regulator. Its output can rise by adding diodes, accurate, easy, and save. See more!
When I need to use DC regulator power supply 18V 1A for the transistors pre tone control circuits.
2 ways to increase current from IC-7805 or IC78xx series Learn more more low cost!