[time-nuts] Clocking a PIC16F628A from a Rubidium Standard

Brooke Clarke brooke at pacific.net
Sat Nov 26 16:50:14 EST 2011


Hi Don:

Not a good idea.  There are a number of fault conditions that can cause Neutral to be tens of volts above ground.  Tom's 
circuit with a Meg in both the Hot and Neutral lines is much safer for you equipment.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.End2PartyGovernment.com/


Don Latham wrote:
> well, grudgingly. only need the 1 meg to the hot side of the line, no
> connection to the neutral needed, with 1 meg in there, normal ground
> connections are going to supply the low side...It still lurks...
> Don
>
> Tom Van Baak
>>> Come on, folks. never hook anything directly to the power line. The
>>> source is just too stiff. Use an opto. I used fiber optic isolation
>>> with
>>> my big DC power supply.
>>> Don
>> I used to agree, until actually tried it myself. Now this is how
>> I do my picPET 60 Hz data logging:
>>
>> Simple 60 Hz AC Mains Cycle Detector
>> http://leapsecond.com/pages/ac-detect/
>>
>> /tvb
>>
>>
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