Thank you very much for the amazing video! Because of your video, my brain got enlightened! However, here is my two cents (I think I am right. May be!!!): the collector's current is not perfectly rectangular; instead, just below base's voltage under 0.7 volt should be little curvy because, at little below 0.7 volt, the collector current is still flowing but much less than when base's was 0.7 volt.
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Thank you very much for the amazing video! Because of your video, my brain got enlightened! However, here is my two cents (I think I am right. May be!!!): the collector's current is not perfectly rectangular; instead, just below base's voltage under 0.7 volt should be little curvy because, at little below 0.7 volt, the collector current is still flowing but much less than when base's was 0.7 volt.
Good point!