[time-nuts] 60Hz zero-crossing
magnus at rubidium.dyndns.org
Sun Jul 3 23:01:27 UTC 2011
On 07/04/2011 12:32 AM, WB6BNQ wrote:
> Hi Don,
> After Tom referred to the app note, I went and looked it up. While it is
> functional I would, by no means, ever suggest anyone actually use that method.
> It presents the possibility for personal injury and circuit failures. Even for a
> skilled veteran, all it takes is one thoughtless moment and you could have some
> serious problems.
> What surprises me is that ATMEL treated it so cavalierly and even allowed such a
> publication. At the very least, the schematic should have had additional
> treatment to indicate the seriousness and shown some method of the resistors
> being physically mounted to a power plug that was protected from being touched.
> They did mention the problem but just barely. Shame on them !
Bet their lawyers didn't get to approve it :)
Tom's approach of using a AC wall-wart is much safer.
Oh... and if you mess around you can toast your PC with Error 230,
that's when you burn out you PC with mains... I've seen it done.
> Don Latham wrote:
>> Here is at least one interesting possibility:
>> 1 pps into another input to say your friendly Arduino, and a little
>> Pete Lancashire
>>> Someone mentioned a modern chip for detecting zero crossing.
>>> I seem to have deleted it
>>> Anyone have it ?
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>> "Neither the voice of authority nor the weight of reason and argument
>> are as significant as experiment, for thence comes quiet to the mind."
>> R. Bacon
>> "If you don't know what it is, don't poke it."
>> Ghost in the Shell
>> Dr. Don Latham AJ7LL
>> Six Mile Systems LLP
>> 17850 Six Mile Road
>> POB 134
>> Huson, MT, 59846
>> VOX 406-626-4304
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