Isolates the 47uF capacitor with a diode. Matches the voltage drop so there is a consistent power level across USB or GC cable. Prevents inrush current on USB power.
Added 100k resistor between sgnd and gnd of usb connector
Added USBLC6 to protect USB data lines
Added TVS diodes to GCD and 3.3 lines
Added 47uF bulk capacitor
