I went through all the resources listed in the previous submission here: <a href="http://electronicsforu.com/electronicsforu/circuitarchives/view_article.asp?sno=1621&article_id=12580&id=12580&page=1#.U8PfhRbxWqk" rel="nofollow">http://electronicsforu.com/electronicsforu/circuitarchives/v...</a>. However, people had legit complaints about popups and broken links. So, I went through all resources manually, double checked links, and added more information about the resources.