[time-nuts] Line Frequency

[Jimmy D. Burrell]

I know that last night, while building my mains measuring circuit (might as well get in the act), my counter probe was laid next to my A/C - A/C wall wart transformer's termination on a breadboard and it started counting. Took me a second to figure out what was going on. :)  It would certainly seem a viable option.

Jimmy...
N5SPE

On Feb 10, 2014, at 11:57 AM, Tom Van Baak <tvb at LeapSecond.com> wrote:

>> You should really have isolation from the mains. The transformer scheme
>> is fine. I don't like the high value resistor approach.  

> <...snip...>
> 
> Alternatively, has anyone considered grabbing 50/60 Hz from the air? Just about any dangling unshielded wire will act as a pickup. Maybe not as robust a signal, but this is not so much a problem for solutions already using a hardware or software PLL. And it certainly wins the safety prize. Call it the iClock Air...
> 
> /tvb
> 
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