Regarding what PSU route is best for Khadas TB its probably good enough have peace in mind with some overdoing here and there : ) that said i'm not shure designers didn't take care some USB ports can be crap and designed unit to be more or less immune, pages back there was a few trials shared about external power supply use where one of them included pictures and none noticed any audiable effect, so quistion is if any low noice LT3045 is really needed else Khadas guys probably had implemented it from start on. Think it looks ab fabric be a high performance design seen in Amir's measurements for naked Khadas TB and boxed March Audio dac1 plus myself tested boxing process looking into a high resolution FFT and there was not a piece of grass difference between naked board / boxed floating board non GND / boxed GND via one brass standoff / boxed GND via two brass standoffs / boxed GND via three brass standoffs. Only thing FFT test revealed was far down low 50Hz spike plus its harmonics from power line at left side of 1kHz stimulus was present when Laptop was powered from external power line and switcing to batteri left side was clean, but that can change from Laptop to Laptop if they don't add other noice spectra powered form batteri. Some day will try external power myself but in all objective data seen so far looks so great and sound is sensed excelent powered via USB buss is a bit relaxed it will make a difference.