Diodes Lessons
https://www.youtube.com/watch?v=MGVf-18Rv7g&list=PLA8D2D29f-gJJhCFfTec5vhUTq-G8H5Ou&index=21
https://www.youtube.com/watch?v=UoVbT36long
https://www.youtube.com/watch?v=JNi6WY7WKAI
https://www.youtube.com/watch?v=46WSCihjoRI&list=PLAROrg3NQn7cyu01HpOv5BWo217XWBZu0&index=19