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Note: the higher the LED peak current, the narrower the output pulse centered about the true zero-crossing. BUT - also, the higher the operating current, the higher the power dissipation in the two resistors. It is a trade-off.
I'm curious why a higher peak current would result in a narrower pulse. Higher current means lower value resistors, which should allow the LED to turn on earlier in the sine wave cycle.
Oh yeah. Zero-crossing. D'oh.
From my post to your thread on another forum:I want to use it for dimming a halogen lamp (220v ac)"