I am trying the CIRC-08 in the Sparkfun Inventor’s Guide. I have placed the paper mat for this experiment over the breadboard and plugged in the various items. The connection near the +Led connection reads: “to pin13 then pin 9”. There is no reference to pin 9 in the code, and how and why do you connect from pin 13 to pin 9??? I connected pin 13 to the +side of the Led, but do not get any results by turning the pot.