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Zero Crossing Detector

Zero Crossing Detector

As the name indicates the zero crossing detector is a device for detecting the point where the voltage crosses zero in either direction. As shown in the above circuit diagram the first section is a bridge rectifier, which provides full wave rectified output.

http://www.visionics.ee/curriculum/Experiments/Zero%20Crossing%20Detector/Zero%20Crossing%20Detector1.html

Zero Crossing Detectors and Comparators

Zero Crossing Detectors and Comparators

Zero crossing detectors as a group are not a well-understood application, although they are essential elements in a wide range of products. It has probably escaped the notice of readers who have looked at the lighting controller and the Linkwitz Cosine Burst Generator, but both of these rely on a zero crossing detector for their operation.

http://sound.westhost.com/appnotes/an005.htm