While the videos are primarily aimed at English teachers, I think learners of all levels can benefit from Adrian's pedagogical explanations about the phonemic chart and about how to distinguish and pronounce all the English sounds.
Five videos have been published in the series so far, and I think a few more are to come. They are regularly posted in the Macmillan Life Skills site here. or in their YouTube account here.
First video: Introduction
Second video: The chart, part 1
Third video: The chart, part 2
Do not forget that all English teachers and learners have at their disposal Adrian Underhill's interactive phonemic chart, where we just have to click on a phonetic symbol to hear it spoken.