As my degree is not in a discipline directly related to my work in audio, I'm looking to get a firmer grasp on principles of electronics, electro-acoustics, circuits, electricity, etc. I've been browsing Berkeley's and MIT's online course selections. Does anyone have any positive experiences to speak ok with these programs or others? I'm not looking to get a degree, but I want to find a structure that will organize my learning more than periodically looking up articles on the internet. A series of introductory level undergraduate courses will probably do the trick. Thanks in advance.