Apologies, apparently the first time I sent this reply it only went to Doug. Here it is for public view.
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Your primary circuit and your secondary circuit make up two resonant circuits, both ideally "tuned" to the same resonant frequency. Your secondary coil and topload generally set the resonant frequency. The resonant frequency is determined by the formula Fres = 1/[2*pi*sqrt(L*C)], where L is the inductance of your secondary coil and C is the capacitance of the topload (we're ignoring parasitic inductances and capacitances here, for simplicity sake). The same formula is used to find the resonant frequency of your primary tank circuit, where L is the inductance of your primary coil and C is the capacitance of your tank capacitor. Based on this formula, in order to maintain the same Fres (to match your secondary circuit) when increasing capacitance C you need to decrease inductance L. Similarly if you increase inductance L, you need to decrease capacitance C. So I was wondering if you could decrease your capacitance in order to allow you to use more turns on your primary coil to improve the strength of the generated electromagnetic field.
Best,
Matt Lewis, Fairlee VT
-----Original Message-----
From: Douglas Johnson <doug379306@xxxxxxxxx>
To: derstrom8 <derstrom8@xxxxxxx>; Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Sun, Feb 17, 2019 4:51 pm
Subject: Re: [TCML] Coupling
The way I have this set up I can go 15, 10 .5 tank, and change primary from .06 to .250 to .380.And could you please explain why less tank = more primary turns? I told you I wasn't very technical😉Doug
On Sun, Feb 17, 2019 at 4:42 PM derstrom8--- via Tesla <tesla@xxxxxxxxxx> wrote:
Hi Doug,
Is there any way for you to reduce your tank capacitance so that you can use more turns on your primary? I'm no expert myself but I'm thinking more primary turns and slightly less tank capacitance is better than very few primary turns and a large tank capacitance. Perhaps someone else could chime in here with better qualifications?
Regards,
Matt Lewis, Fairlee VT
-----Original Message-----
From: Douglas Johnson <doug379306@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Sun, Feb 17, 2019 4:24 pm
Subject: Re: [TCML] Coupling
Hi Gary, Thank you, You can probably tell from most of my posts that I am
not very technical concerning this stuff, but I have an insatiable appetite
to learn. That said, I am continuing to try to improve the performance of
this little coil, since the video I have improved tuning until l now I am
getting " breakouts" from both ends. When I get the coil tuned to what I
think is optimum, which may include working to improve the primary. {I
think I have too many turns on it because I am down to using only about
three}, I will do another video, so any requests or instruction on what to
look for would be helpful.
Doug
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