I'd like to add Noel's Retro Lab to the list: https://www.youtube.com/c/NoelsRetroLab https://www.youtube.com/c/NoelsRetroLab One nice thing he does is putting

I'd like to add Noel's Retro Lab to the list: https://www.youtube.com/c/NoelsRetroLab https://www.youtube.com/c/NoelsRetroLab One nice thing he does is putting a tiny scope probe symbol on the part of the schematic diagram he's currently investigating.