[time-nuts] 60Hz zero-crossing

Don Latham djl at montana.com
Sun Jul 3 23:53:14 UTC 2011


Hi Bill: I agree! even using a transformer without optoisolation gives
me pause ... I just found the stuff, don't suggest  it.
Don

WB6BNQ
> 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 !
>
> Bill....WB6BNQ
>
> Don Latham wrote:
>
>> Here is at least one interesting possibility:
>> http://www.atmel.com/dyn/resources/prod_documents/doc2508.pdf
>> 1 pps into another input to say your friendly Arduino, and a little
>> programming...
>> Don
>>
>> Pete Lancashire
>> > Someone mentioned a modern chip for detecting zero crossing.
>> >
>> > I seem to have deleted it
>> >
>> > Anyone have it ?
>> >
>> > -pete
>> >
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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
>> www.lightningforensics.com
>> www.sixmilesystems.com
>>
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>
>
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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
www.lightningforensics.com
www.sixmilesystems.com




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