Scott,

According to that last posting about the sine wave generation (not about
determinism <G>), it appears to me that you are expecting to see a sine wave as
an input.  I'm not so lucky - I just get a 60uS pulse during the zero crossing,
as determined by some off-chip electronics.

Do I want to implement a FIR filter and try to track either 50 or 60 Hz (yes,
it's supposed to lock to either one) with a PID loop? Guess I got a little
confused - that was basically my thought.

As for amplitude, I only have to generate a 0-5V sine wave at the right
frequency (determined by the incoming line);  the power electronics convert that
to 480V for me.

Thanks.

Andy

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