Sorry if in some of the links above already mentioned:For recognizing the zero crossing,clipping diodes and a resistor for keeping the current low enough (Imax of diode @ Umax) should do the job.http://en.wikipedia.org/wiki/Clipper_(electronics)edit:Well, of course it has to look like here in the first post with an additional resisor at Vin.Also Schottky Diodes should be used...http://www.mikrocontroller.net/topic/78414Sorry for not finding the right picture in the first.
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