I was wondering why there are different symbols for common mode chokes and if/how they affect the way I have to connect them.
(Upper image is incorrect but left here for understanding the comment from @Felthry)
Most often I see type 1 and there is no doubt on how to use them. But with types 2 and 3 I'm not so sure. They must have different meanings as I saw them simultaneously in one circuit. Can anyone enlighten me or refer me to a decent source on what the difference is?