Can someone please tell me the purpose of L1 and C5 in this schematic? http://www.olimex.com/dev/images/PIC/PIC-USB-STK-A-sch.gif The connector is for SD memory. The cap seems to be an over sized decoupling cap. But if I had to guess I would say the combo has do do with hot swapping of the SD memory chip. Does it reduce voltage spikes on the chip when it is connected?