These are for the most part higher level then what you are asking for.
There is a professor I know whom has put many videos on youtube to teach about a range of concepts.
Some are about changing education, some are about engineering design, and some are about optics related concepts. Now, none of these may interest you, but he does one of the better explanations of a Fourier transform. Fourier links to the first, transform links to the second part, in case you have a hard time finding it.
This professor is big on trying to make engineering education more available to students, and feels with good teaching almost anyone can learn the basics of very complicated subjects, as you see he does some basic maxwell's equations(very basic) and teaching many concepts related to his lasers class. Students build a working laser with a gain medium and mirror by the end of it.