Paul, going thru the chapter 3 materials on the premium channel, i ran into a small problem where i could not find the lessons for power side switch circuits. in other words, the chapter play list on the premium channel repeats itself. pages 13-18 are repeats of the same video. it doesn't show the power side switch lessons. i hope i'm explaining my self correctly. if not give me a call, and I will discuss it with you.