[time-nuts] 60 Hz measurement party

[Kasper Pedersen]

On 06/25/2011 09:34 PM, Tom Van Baak wrote:
> We are more a group of experimenters than lamenters, so
> here's an open invitation to all of you in the US to join me
> on a 60 Hz measurement party, starting as soon as you
> can and lasting as many weeks or months that it takes to
> get interesting plots.
> 

Here is what I have used with far better success than transformers. For
some reason the transformers I get hold of have quite large phase error
(ie. they are cheap and get warm).

http://wap.taur.dk/zcd/sch.jpg
http://wap.taur.dk/zcd/plug.jpg

Cp has the dual role of killing RF, and compensating for the H->L
threshold of the HC14. It sits on the hot side, and charges up through
the protection diodes for the next 200us pulse.
It will drive 10m of POF.
Substitute an opto coupler of choice if you need less isolation.

/Kasper Pedersen