If you can stand the video format, this one is unusually rewarding for being a youtube channel: [link] I started with this one: [this video] "My old BBC Micro system" ... which kind of established his credibilities in my mind, and then I just kept going, devouring his entire channel. Recommended - this guy knows his stuff, and unlike certain other youtube channels in this genre there is no annoying bravado.
Starting point for a rewarding channel with deep electronics knowledge
Mikes Electric Stuff is one of my absolute favourite channels on YouTube. Highly recommend. A couple of classics: Heavily modified BBC Micro: [this video] Design of LED sculpture with some interesting commentary: [link]
Heavily modified BBC Micro from a favourite channel
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