Disclaimer: THIS IS NOT A LECTURE. This is only a tutorial/recitation which includes a neckbreaking review of some of the theory seen in class with an emphasis on the topics that are covered in the three numerical examples presented. One in linear mode, the second one in saturation, and the third one in cut off. It is NOT a new video. It is the merging of four old videos from two years ago (when the YouTube time limit was much smaller) into a more coherent unit. Less than half an hour in the video would be a 50 min tutorial session in a classroom.