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

[Bob Camp]

Hi

> On Dec 16, 2014, at 11:03 PM, Charles Steinmetz <csteinmetz at yandex.com> wrote:
> 
> Bob wrote:
> 
>> The Collins paper on hard limiters does indeed apply here. You *could* make a 60 Hz chain that got down into << 1 us sort of resolution.
> 
> I don't know how "much less than" 1uS you mean by "<<", but I was seeing less than 1uS jitter with the circuit described.
> 

… as in sub ns if you wish to put in enough stages in the chain. The number of stages is a limit on how good you get. 12 or more stages seems a bit over the limit for this sort of thing. Thus the indeterminate units.

Bob

> Best regards,
> 
> Charles
> 
> 
> 
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