I thought it might be curious to see this hub design (prior to my modification). It seems at least some sort of consideration went into designing the power supply. If you read the NEC 720114 datasheet, it appears that Vbus can be used just for "handshake", and the rest of the chip is powered by the +5 V supply through the EH11A regulator. In my case, it runs off a rechargeable battery. I might eventually remove D2 for the extra assurance. Thus, I did not see it relevant to install the inductor on the Vbus line. The way I have it now is in hope it alleviates some hi-frequency currents between my hi-fi and my laptop via USB ground. By the way, ALL of my power supplies are TWO pin, for better or for worse.
