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Re: [TCML] bipolar coil
Kris,
Here is a picture of Dr. Jeff's small bipolar coil: http://www.drspark.org/images/jeffbipolar/Dsc_0185.jpg If I recall correctly, he's using a 9kv / 30ma neon sign xfmr with a Sangamo mica transmitting capacitor and a 5-break stationary spark gap. Tuning doesn't seem to be very critical. Secondary is rather small, maybe 2" x 12" or so. Small coils are alot of fun!
Woo
> [Original Message]
> From: bartb <bartb@xxxxxxxxxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Date: 5/2/2008 7:40:38 PM
> Subject: Re: [TCML] bipolar coil
>
> Good point! I agree. This 2.375" diameter secondary doesn't need 150mA.
> That's a huge amount of power for such a small coil. Use at least a 4"
> secondary or larger for 1350VA power.
>
> The fact that the coil is this small will make primary tuning that much
> more difficult (very little inductance per coil). Move the tap 3" can
> cause a huge shift in resonant frequency. This is starting to sound like
> a problematic coil, but good to realize ahead of time.
>
> Kris, is it too late to advise against this coil size? Have you already
> gone ahead and wound the coils or are you only in design mode?
> Unfortunately, often the coiler has built parts before asking. Hope this
> isn't one of those moments.
>
> Bart
>
>
> > Hi
> >
> > Just my most humble opinion, but that is an awful lot of power for such small
> > coils. I would think a single 9x30 would be quite adequate, a single 9x60 at
> > the most.
> >
> > later
> > deano
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