[time-nuts] 60 Hz frequency and phase measurement

[Tim Shoppa]

Jim, almost any mains powered lighting has a substantial 120Hz component in
light intensity. It's quite reasonable to trigger off this at nighttime if
the light is on and only that single light is in field of view of a
phototransistor (no car headlights allowed to come into view!)

It's still far far easier to plug in an AC wall wart.

Tim N3QE

On Wed, Jul 3, 2019 at 1:01 AM jimlux <jimlux at earthlink.net> wrote:

> On 7/2/19 4:09 PM, Dana Whitlow wrote:
> > I've always noted that casual attempts to pick up 60 Hz with small
> antennas
> > etc see more harmonics and other trash than actual line frequency.  But
> if
> > you're in an office environment, why not plug something in?  It's quite
> easy
> > to build a simple passive diode clipper/filter that will plug into a wall
> > outlet and
> > which will provide a sort of soft (but clean) squarewave at a voltage
> level
> > convenient for lab instruments and with good protection against big
> spikes
> > and
> > other trash riding on the line.
>
>
> Safety approvals are one obstacle (of course one could use a AC wall wart).
>
> Actually, it's because someone asked me about a science experiment where
> you'd place them in a neighborhood outdoors.
>
>
>
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