Also I would recommend taking a look at **broken link removed** It's made by an engineer who is basically obsessed with Cuk converters, enough that he made an entire website explaining the pros and cons and pitfalls. However, he apparently has no talent for website design, and the site is terribly difficult to navigate. In fact for all I know the author is literally insane, but even so a lot of what he writes is very thought provoking, such as **broken link removed**.