I've done some looking and have searched the forum without any luck, so I hope I'm not duplicating some other discussion.
John mentions in his encoder tutorial the use of "slot" IR sensors and has the following picture:
I can't find anything resembling that IR sensor anywhere one would commonly expect to find these things. Does anyone have any idea where to get one?
I assume the advantage is that it's shielded so you don't have to use tinfoil and electrical tape. Besides, it just looks nifty.