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Re: [TCML] Yet another NST Depotting Topic

It will always give a higher current with shunts removed. The more removed, the higher the current. But, when it really starts to climb high, it's too many removed. You'll probably be ok at 120mA. 

Take care,
Bart

Phillip Slawinski wrote:

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.



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