Re: [Phys-L] Making video content with incandescent light and 100Hz bands problem

[John Denker <jsd@av8n.com>]

On 05/13/2012 02:33 PM, Bernard Cleyet wrote:
> That's a thought, and very easily done.  Well, .. depends on the your
> domestic supply.   Nearly everywhere in the US 240V is supplied with
> three wires -- discussed interminably on phys-l.      the "middle"
> wire is grounded physically and spiritually.  its common as the
> "return" for the other two which must be Pi phased otherwise one
> wouldn't obtain 240 V.   So the prob. is connecting one lamp to one
> leg and tother tother.
>
> I once wired a power fan out so adjacent sockets were alternate legs.
> The sockets were spaced, so one could plug a plug in half of adjacent
> sockets to obtain 240V.  Or may be this was, more likely, a wall
> socket.
>
>
>
> Now the question  dose this result in a constant illumination.
> Ideally I think so.   the EMFs are sin(120Hz*2PI*t) and cos

Not a chance.  sin and cos are 90 degrees out of phase.
The black and red power wires are 180 degrees out of phase.

The DC solution is easier and better than anything you could
do by fiddling with the AC phases.