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

[Atomic <atomicrox@xxxxxxxxx>]

Why did you get a larger size, Bart?

Thanks!

On Fri, Nov 30, 2012 at 3:34 PM, Bart B. Anderson <bartb@xxxxxxxxxxxxxxxx>wrote:

> 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=**
> B64290L0659X037virtualkey59250**000virtualkey871-**B64290L0659X037<http://www.mouser.com/Search/ProductDetail.aspx?R=B64290L0659X037virtualkey59250000virtualkey871-B64290L0659X037>
>
> Material is T37, AL=9800 ą25%, 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<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-**<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<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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