Talk:RPi 5V PSU construction
Interesting tutorial, and absolutely useful, at least for beginner users.
What I would be interested in: Why not just use the 7805 the way it was designed to be used, with VRef on ground level? And if you want adjustable output voltage, why not use an LM317 that is supposed to be adjustable?
>> If you read the guide properly, you'll find that the additional resistors are there to get a slightly higher voltage - 5.25V ;)
>> Yes, you can make a similar circuit with LM317, but we don't need variable voltage here, just a little adjustment.
The Basic Idea Schematic: The Resistor that should be marked as R2 is marked as R10 in PSU_7805_v01.jpg