Linear power supply

[hazelnut]

Some more on using a 12V supply, you can get prebuilt modules that'll do this, one lot based on the ubiquitous LM317, the other on the much more recent AMS1117, both costing a few dollars.  Both are also bare-bones, copied-from-the-data-sheet designs.  However, what this means is you could run your System Blue from a 12V, or whatever's left of 12V when it gets to it, supply and get a nice solid 5V supply sent to the Blue, you'd just need to add a barrel jack connector and one of those two types of modules heatsinked to the inside of the case.