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Was able to access lab again today. You were right Klauss. The PCB layout was indeed faulty. The line connecting D1 and D2 was open circuit. Added a short across it and the circuit is working smoothly.
Thanks everyone for the help
Could not get into my lab today. Will check with the resistor first and update. The noise patterns are also a bit varying. Will send those pics as well.
The design worked flawlessly on breadboard.
However when implemented on a PCB it shows noise in detection of one half cycle.
The original circuit again
Any inputs why that would occur. One limitation is on my PCB is that the input to the optocoupler is longer parallel lines on the PCB...
I have found a zero cross detection circuit at
I want to control a fan speed. So the zero cross detection is not very critical.
However I would like the power loss to be minimum. Also have been looking for low cost components.
Just wanted a review on this circuit. Does it seem rugged for...
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