eevblog is wonderful! During a recent side-track into electronics, I've been consuming all of Dave's (EEVblog) videos, all of Mike's (mikeselectricstuff) videos and all of Ben Krasnow's videos (Applied Science).

EEVblog is very specific to EE, Mike's Electric Stuff is electronics as well, but tends much more toward tear downs/obscure components/reverse engineering and Ben's channel is just a delectable collection of DIY everything. Ben became famous for building his own (and probably first DIY ever) electron scanning microscope, but has videos where he builds all sorts of amazing things in his home shop.