I've found "Big Clive" to be very informative. Lots of small devices torn down and reverse engineered, complete with a circuit diagram and a fairly in depth explanation of what is going on and what any given part is doing. Helps to have some basic circuits knowledge, but otherwise very good.
EEVBlog is great, but... anybody just discovering the channel should be aware, Dave puts out content that fits into a number of different categories: educational, entertainment, edutainment, test equipment reviews / teardowns, mailbag, repairs, debunking, meta commentary about Youtube, career stuff, and "other". And purely educational stuff isn't a huge part of what he puts out these days. That said, he has put out some really good stuff, especially back when he was doing "Fundamentals Friday" as a routine thing. Just don't expect a steady stream of purely educational, "electronics fundamentals" stuff.
> And purely educational stuff isn't a huge part of what he puts out these days
That's my reading, too. He isn't quite the 3b1b of electronics. But that's not a statement of the quality of the content; just that he caters to a different audience, perhaps.
I think I've a PDF copy of The Art of Electronics. One day...