I am now at the stage of choosing caps and resistors for this circuit I am looking at the method of selection at http://www.mouser.com/Passive-Components/Capacitors/Ceramic-Capacitors/_/N-5g8m/ as given to me by #12 of this forum, but am confused as to whether the case code is imperial or metric. How do I tell please. I am leaning towards imperial because it lists both the 0603 and 0805 which are the only two case codes used in my circuit, whereas the metric listing here http://www.resistorguide.com/resistor-sizes-and-packages/ only list 0603 in the metric codes if that makes sense. Any help appreciated please.