[time-nuts] Simple AC mains zero-cross detector
csteinmetz at yandex.com
Wed Dec 17 04:03:44 EST 2014
>What are you going to do with data from the line accurate to 1 microsecond?
Me? Nothing. I don't find the meanderings of the mains frequency
all that interesting, aside from observing them from time to time via
the sweep second hand of a synchronous wall clock. But lots of other
folks do (including our fearless leader, tvb), and they like being
able to correlate grid events to single-digit uS (lightning strikes,
sections of the grid going out, etc.). That said, I didn't slave
away trying to get the ZCD jitter below 1uS -- I anticipated that it
would be, just because there's nothing in the design to prevent it,
so I wasn't surprised when it worked out that way.
Everything works if you let it.
Corpus C. Redfish
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