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Re: New coil takes shape
Original poster: "Mike Tucknott" <michael.tucknott@xxxxxxxxxx>
Hi All
Well it was back to the drawing board, and I`v come up with an extra space
saving plan. I increased the distance between the layers to 25mm and they
will be inclined at 30deg. so yes we are talking conical twin stacked
primary
with a foot print of 24" square and it will still have 20 turns.
This should also make taping a lot easer.
Cheers Mike Tucknott
>
>
> > Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>
> >
> > Mike,
> >
> > I sincerely hope your 10 mm between layers is filled with something
more
> > insulative than air! If it's only air, than the outer part of your
> primary
> > windings will surely arc to each other--very bad!
> >
> > Here is what Malcolm Watts sent me in 2000 regarding his stacked
primary:
> >
> > "The simplest approach is to design a spiral for about 30% of
> > the total inductance needed and then build a second identical
> > spiral and stack them with a spacing between spiral layers of
> > about 4 times the conductor diameter which allows room for
> > insulation.
> > I prefer to spiral one inwards and the other back
> > outwards and tap inwards from the outer edge of the lower
> > spiral and usually use a sheet of acrylic to separate the
> > layers."
> >
> > --Steve Y.
> >