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RE: [TCML] Secondary self frequency



Hi Herr Zap,

 

I am using an older version of Classic Tesla Java TC (9.1) locally for quick
reference. I typically enter 20% as was suggested at the time so I have been
making an error for some time which explains why my actual tap selection is
generally off.

 

Barton, should I enter "0" for toroid reduction percent?

 

Thanks for catching that.

Jim Mora

 

 

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Quarkster
Sent: Friday, July 03, 2009 9:31 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Secondary self frequency

 

Jim -

 

How did you arrive at a topload capacitance of 24.5pF?

 

I think this is at least 20% higher than actually provided by 4.5 X 18" 

toroid.

 

Regards,

Herr Zapp

----- Original Message ----- 

From: "Jim Mora" <wavetuner@xxxxxxxxx>

To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>

Sent: Friday, July 03, 2009 4:18 PM

Subject: RE: [TCML] Secondary self frequency

 

 

> Hi Andrew,

> 

> First impression is with a top load that size something sure isn't right.

> Let me run Classic TC:

> Turns=716

> 32.6/inch

> Ratio 5.5 (lower yet)

> DC ohms=12

> XL=18763

> K=.8472

> Self C=8.61

> Fo=~583Khz (coil only)

> Top Load= 24.5pf

> LOADED Fo= ~346Khz

> 

> You are measuring it with the top load attached, yes? Perhaps you are

> looking at a harmonic? It really should be near 350Khz loaded.

> 

> Regards,

> Jim Mora

> 

> -----Original Message-----

> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf

> Of Andrew Robinson

> Sent: Thursday, July 02, 2009 9:45 PM

> To: tesla@xxxxxxxxxx

> Subject: [TCML] Secondary self frequency

> 

> Does this sound strange to anyone. A 4" OD x 22" (windings) secondary

> using 22 gauge wire with a 4.5" x 18" spun alum toroid having a self res

> freq of around 515kHz? I ran the tests in the lab today and thats what

> im getting. For some reason though, I had reason to believe it was going

> to be much lower. I'm gonna resubmit this email next Thursday when I get

> a chance to get back in the lab and im gonna take a video of myself

> taking the measurements. Maybe im just doing something wrong. I just

> threw this website (http://www.teslamad.com) together just now for the

> purpose of this email. Please go check out the pics to get a better idea

> of whats going on. This coil isnt finished yet. You may have noticed the

> quickie ghetto gap and, my old rotary disc from an old BIG coil on my

> new RSG mount. In addition to my freq question above, I also have

> another... im not getting anywhere near what I expected to, performance

> wise with this coil. 2 - 6in max off a break out point. By the way, that

> toroid i just got in the mail today from OW landergren... Most amazing

> craftsmanship I have ever seen and extremely robust and heavy duty! Took

> it to the machine shop today to center tap it and it was "over" a 1/4"

> thick of aluminum in the center. Just google them.

> 

> I know everyone needs numbers to even begin to help me and I figure I'll

> resubmit a detailed report of my findings to the list like I said, next

> thursday. Hopefully then with plenty of data, pictures, video, etc...

> someone out there will say that catchy phrase "Well theres yer problem!"

> Thanks everyone! Hope you all enjoyed my new coil pics... even if it

> doesnt work hahahaha.

> 

> Regards,

> Andrew Robinson

> 

> _______________________________________________

> Tesla mailing list

> Tesla@xxxxxxxxxxxxxx

> http://www.pupman.com/mailman/listinfo/tesla

> 

> _______________________________________________

> Tesla mailing list

> Tesla@xxxxxxxxxxxxxx

> http://www.pupman.com/mailman/listinfo/tesla 

 

 

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