[time-nuts] Simple AC mains zero-cross detector

Bob Camp kb8tq at n1k.org
Wed Dec 17 07:44:08 EST 2014


> On Dec 17, 2014, at 3:27 AM, Hal Murray <hmurray at megapathdsl.net> wrote:
> csteinmetz at yandex.com said:
>> That one is not ideal for this task, because (i) its output pulse is
>> symmetrical about the mains zero cross, and (ii) the hysteresis zone  is not
>> well characterized and will drift with temperature and input  voltage.  So,
>> there is no edge that is well characterized in relation  to the AC mains
>> zero cross. 
> What are you going to do with data from the line accurate to 1 microsecond?

or a nanosecond …

Obviously it would depend on just what your system needed to do and the signal to noise on the 60 Hz input. 


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