An AC generator is shown on the left. The top of the generator connects to one end of a 990 k ohm resistor. The other end of the resistor connects to an inductor which is labeled L. The other end of the inductor connects to common which goes back around and connects to the bottom end of the generator. The junction of the resistor and inductor connects to a capacitor which is labeled C. The other end of the capacitor connects to the common line. The inductor and capacitor are connected in parallel. Also in parallel with both is a resistor labeled Rp.