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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
>
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>
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