How Does a Transistor Work?
https://www.youtube.com/watch?v=IcrBqCFLHIY
https://www.youtube.com/watch?v=g_IaVepNDT4
https://www.youtube.com/watch?v=rtI5wRyHpTg
https://www.youtube.com/watch?v=zxZ7TFdXZRA
https://www.youtube.com/watch?v=72DCj3BztG4
https://www.youtube.com/watch?v=FhmLBxyX8Dw