Re: More maggie Q & A

Tesla List wrote:
> Original Poster: Michael Tucknott <Michael.Tucknott-at-virgin-dot-net>
> Hi all
> thanks Ed, DC, Malcolm
> I wound the driver coil yesterday it is on a pice of 9.25" pipe with
> a height of 16.75" (H/D ratio 1.81:1) wound with 1mm (18AWG) magnet
> wire it has 395 turns or there abouts.
> The inductance of this coil is 15mH.
> I intend to wind the primary out of 1/4" copper pipe with as many turn
> that will fit in, this should also compensate for the small cap
> 0.0151uF.
> I plan to use an existing secondary (4.25" by 22" 22AWG)as my extra
> coil.
> This coil has 13.5mH of inductance and a self C of 9pF.
> Now for the next qustion.
> I read somewhere(I think it was by Richard Hull)that the extra coil
> should
> have more inductance than the driver, can anybody shed any light on
> this.
> Many thanks Mike Tucknott(maggie building in swindon home of the Honda
> civic)


You want to keep the inductance of the driver as low as possible and the
inductance of the extra coil as high as possible...within reason.  It is
possible to have the inductance of the extra coil too high.
Experimentation will give you a "feel" for good working driver/extra
coil ratios.

As an example, my current driver contains 1200 feet of #10 stranded wire
and has an inductance of 16 mH. The extra coil contains approximately
3000 feet of #18 magnet wire for an inductance of 80 mH.

I highly recommend Richard Hull's book, if you don't already have it!

I hope this info helps.

Ed Wingate RATCB