Re: [TCML] Yet another NST Depotting Topic

["Phillip Slawinski" <pslawinski@xxxxxxxxx>]

I've removed enough shunts to get 120mA.  I wonder though if I should be
running slightly under that because when it's used in the TC it will give a
higher current.  Oh well, with my luck that won't even be a problem.  This
NST is doomed to failure within five minutes of operation with the coil :(

On Tue, Jul 8, 2008 at 7:51 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:

> Hi Phillip,
>
> As I mentioned to someone else recently with the same size NST and
> depotting situation. I personally would not go over 100mA output. The main
> thing is to be able to run full voltage without running into core
> saturation. If you remove too many shunts, then core saturation will occur
> at lower output voltages which is the last thing you want.
>
> Test it. Remove about 1/2 the shunts then dry test and measure the output
> current in a shorted output test. Also measure the input current in the same
> test to ensure it doesn't climb too high at full voltage input. If you want
> to run it right to the edge, then you will have to remove a few shunts at a
> time and redo measurements. Find out where saturation occurs at full
> voltage, then back to give your self some margin by reinstalling some
> shunts.
>
> Also, "if" you are going to run it at the edge of core saturation and the
> core gets really hot really fast, then you should choose oil to help heat
> dissipation.
>
> Take care,
> Bart
>
>
> Phillip Slawinski wrote:
>
>> As previously stated, I have a step up transformer.  I'm wondering how
>> much
>> current I can get out of the 15/30 without it having a melt down after 5
>> minutes of continuous operation.
>>
>> On Tue, Jul 8, 2008 at 12:26 PM, Jim Mora <wavetuner@xxxxxxxxx> wrote:
>>
>>
>>
>>> Da, that would double the output voltage by doubling the turns ratio.
>>> Jim
>>>
>>> -----Original Message-----
>>> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
>>> Behalf
>>> Of Lau, Gary
>>> Sent: Tuesday, July 08, 2008 7:08 AM
>>> To: Tesla Coil Mailing List
>>> Subject: RE: [TCML] Yet another NST Depotting Topic
>>>
>>> The 277V primary voltage makes this a less than ideal unit to invest in;
>>> are
>>> you sure it's worth the effort?
>>>
>>> Regards, Gary Lau
>>> MA, USA
>>>
>>>
>>>
>>>> -----Original Message-----
>>>> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
>>>> Behalf Of Phillip Slawinski
>>>> Sent: Tuesday, July 08, 2008 12:14 AM
>>>> To: Tesla Coil Mailing List
>>>> Subject: [TCML] Yet another NST Depotting Topic
>>>>
>>>> Those of you who have been following my topics so far will not be
>>>>
>>>>
>>> surprised
>>>
>>>
>>>> to hear that I have depotted yet another NST.  With five NSTs under my
>>>>
>>>>
>>> belt
>>>
>>>
>>>> I can confidently say that I've got this down to a science.  I can knock
>>>>
>>>>
>>> one
>>>
>>>
>>>> out in just a few hours with little mess.
>>>>
>>>> The transformer I just depotted is a a 277V 15/30 Franceformer.  Does
>>>>
>>>>
>>> anyone
>>>
>>>
>>>> have an opinion on what the most current I can pull out of this is?
>>>>  I'll
>>>>
>>>>
>>> be
>>>
>>>
>>>> putting it under oil or potting it in wax, I haven't decided yet.
>>>>
>>>>
>>> _______________________________________________
>>> Tesla mailing list
>>> Tesla@xxxxxxxxxxxxxx
>>> http://www.pupman.com/mailman/listinfo/tesla
>>>
>>> _______________________________________________
>>> Tesla mailing list
>>> Tesla@xxxxxxxxxxxxxx
>>> http://www.pupman.com/mailman/listinfo/tesla
>>>
>>>
>>>
>> _______________________________________________
>> Tesla mailing list
>> Tesla@xxxxxxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
>>
>>
>>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla