[time-nuts] 60 Hz measurement party

WB6BNQ wb6bnq at cox.net
Tue Jun 28 22:25:07 UTC 2011

Hi Kasper,

Your picture shows what looks like a battery, but I do not see that included on
the schematic ?

This seems overly complicated seeing as how there are opto-couplers designed for
this purpose.  They even have Schmitt trigger functions incorporated.  All in a 8
pin dip style package designed to provide separation and protection.


Kasper Pedersen wrote:

> 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
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.

More information about the time-nuts mailing list