Intelligent Relay Bypass Schematic Question

[Physonc]

This is just for me as I'm trying to understand what's going on rather than just putting it together, but what does D2 (the 1N5817) does in context between the 5V regulator?

 

[ErickPulido]

that diode is there to protect the regulator IC

source: https://learnabout-electronics.org/PSU/psu23.php

 

[Physonc]

that diode is there to protect the regulator IC

source: https://learnabout-electronics.org/PSU/psu23.php

Thought so, just didn't know why. Thanks for the source as well!!

 

[ErickPulido]

Thought so, just didn't know why. Thanks for the source as well!!

anytime