I was searching for
3.3v/5v DC voltage conversion. I found many schematics and the voltage regulators. But in most of the schematic, they have included a bridge rectifier at the starting. As I am a beginner, I thought bridge rectifiers are only used in case of
AC to convert
DC. I found this similar question but they are discussing about AC volts.
So why bridge rectifiers are used in case of DC power supplies.
Here is the schematic which I found: