[time-nuts] 60 Hz frequency and phase measurement

[Jeremy Nichols]

I built a 6 Volt filament transformer into a small metal box and connected
the secondary to a couple of 5-way banana jacks. In addition to the 6 Volt
output, I put a 100KΩ pot across the terminals with the wiper connected to
a third jack. That way, I can have any voltage from 0 to 6 VAC, avoiding
possible damage to sensitive front ends.

Jeremy


On Tue, Jul 2, 2019 at 8:00 PM Gerhard Hoffmann <dk4xp at arcor.de> wrote:

>
> Am 03.07.19 um 01:25 schrieb Tim Shoppa:
> > Jim, most of us are satisfied to use a 6.3VAC filament transformer to
> step down from 120VAC and isolate from the power line.
>
> Exactly. I used an old 6 or 9V AC wall wart and a resistive 1:3 divider
> last year when the European grid frequency was low because of some
> trouble in the distant south-east. That gave a really stable reading.
>
> <
>
> https://www.flickr.com/photos/137684711@N07/38870750440/in/dateposted-public/
>    >
>
>
> regards, Gerhard
>
>
>
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to
> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.
>
-- 
Jeremy Nichols
Sent from my iPad 6.