EEVBlog – One of my favorites for electronic teardowns, and general electronics practicalities and theory. He also runs a forum that has in my opinion some of the top engineers with an online presence hanging out discussing topics. His website, forum, and videos serve as a wonderful platform. He also has enjoyable presentation format with a certain flair and aussie accent =)

W2AEW – Alan Wolke is a master of RF – Radio Frequency. He has an extensive video library of fundamental topics as well as higher frequency related electronics topics. Alan works for Tektronix, the top oscilloscope manufacturer and he does a great job of teaching through practical applications.

Electroboom – He likes high voltage, sparks and likes to let the “magic smoke” out of electronics, need I say more….