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Could also have used a rectifier with a voltage divider!
Rectifier -> Voltage Divider -> Opto-Isolator -> logic circuit / uC
The capacitor/opto-isolator circuit is a voltage divider of sorts, as it uses the phase shift in the reactive vs resistive components to reduce the voltage. The series RC circuit dissipates less power (less heat) than the equivalent straight resistive voltage divider.
Ken
I've kinda been wondering why you guys have been beating me up about a comment I made. Maybe you guys think I was inadvertently stating that the solution to the problem that was found here was wrong or inferior. This isn't the case! I was just attempting to give an additional solution to the problem.
Thanks.