Re: [TCML] Best GDT core for the mini SSTC

["Bart B. Anderson" <bartb@xxxxxxxxxxxxxxxx>]

I would stick with the higher AL and permeability values myself. The one 
I used was from mouser, a bit more expensive, but worked fine.
http://www.mouser.com/Search/ProductDetail.aspx?R=B64290L0659X037virtualkey59250000virtualkey871-B64290L0659X037

Material is T37, AL=9800 ±25%, u=6000

I sought out this one due to a couple attempts winding with poor 
choices. Winding GDT's (or even CT's) is something you don't want to do 
once.

Take care,
Bart

On 11/30/2012 4:38 AM, Atomic wrote:
> So this core should work fine?
> http://www.ebay.com/itm/Toroid-Cores-Power-Ferrite-1-25mm-inductor-x2-/180695360142
>
> AL of 2500 seems a lot smaller than the 4300 Steve posted.
>
> On Fri, Nov 30, 2012 at 1:30 AM, Michael Twieg <mdt24@xxxxxxxx> wrote:
>
> > For a high frequency GDT your main concern is maximizing coupling
> > coefficient, so you should just try to use as high a permeability as
> > possible without having excessive losses in the core.  A common MnZn
> > ferrite like N30 or N87 should work well. Your method of winding it will
> > also have a great effect on coupling.
> >
> > -Mike
> >
> > On Thu, Nov 29, 2012 at 9:05 PM, Atomic <atomicrox@xxxxxxxxx> wrote:
> >
> > > Thanks for the idea, Carl!
> > >
> > > On Thu, Nov 29, 2012 at 1:31 PM, Carl Noggle <cn@xxxxx> wrote:
> > >
> > > > I have used several large (1208) surface-mount resistors in parallel to
> > > > keep the gate inductance low.  Like 4 x 1ohm.  Works fine (this was on
> > > > FETs).
> > > >
> > > > ---Carl
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > -----Original Message----- From: Atomic
> > > > Sent: Thursday, November 29, 2012 5:49 AM
> > > > To: Tesla Coil Mailing List
> > > > Subject: Re: [TCML] Best GDT core for the mini SSTC
> > > >
> > > >
> > > > Hi Steve,
> > > >
> > > > Thanks, I'll get that one and a couple more caps!
> > > >
> > > > Do you know how much current is usually drawn from the 12V regulator?
> > > > I'm inclined to substitute the power transformer and the 12V regulator
> > > > with a
> > > > 2A SMPS<http://dx.com/p/24v-2a-**regulated-switching-power-**
> > > > supply-100-240v-66678<
> > > http://dx.com/p/24v-2a-regulated-switching-power-supply-100-240v-66678>
> > > > > and
> > > > power the 5V regulator from that.
> > > >
> > > > Can I use 1W metal film for the gate resistors?
> > > >
> > > > By the way - feel free to suggest any improvements you might have :)
> > > >
> > > >
> > > > On Thu, Nov 29, 2012 at 3:27 AM, Steve Ward <steve.ward@xxxxxxxxx>
> > > wrote:
> > > >   B64290L618X830
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