There are a lot of good answers in this thread, I'll suggest one that most people may not of heard of. Mark Furneaux - https://www.youtube.com/channel/UCRDQEDx

There are a lot of good answers in this thread, I'll suggest one that most people may not of heard of. Mark Furneaux - https://www.youtube.com/channel/UCRDQEDxAVuxcsyeEoOpSoRA https://www.youtube.com/channel/UCRDQEDxAVuxcsyeEoOpSoRA He does Homelab-style networking, linux, and server management, but also does very detailed teardowns of random or eccentric electronics. For someone like me with very little EE background, he explains the circuitry and the industrial design in a very digestible and interesting way. His teardown of an old traffic controller PSU is one of my favorites (https://www.youtube.com/watch?v=b-F7nKoNqjM https://www.youtube.com/watch?v=b-F7nKoNqjM).