Re: [TCML] 8 inch tesla coil design

[jeremyee@xxxxxxxx]

So the rule of thumb of using only a 3:1 aspect ratio for secondary diameters of 8 inches or more is no longer recommended? It has been several years since I looked at this. Thanks for the input. 

Also, David, I am using an MMC and to up the capacitance I could put another string in there. It would raise the capacitance from 30 nF to 45 nF. Can an NST handle charging this load or will I get erratic behavior out of my static gap?  The LTR recommended for my power supply is about 35 nF. Thanks again for the inputs!

Jeremy
Sent from my BlackBerry device from Cincinnati Bell Wireless

-----Original Message-----
From: DC Cox <resonance@xxxxxxxxxxxx>
Sender: tesla-bounces@xxxxxxxxxx
Date: Thu, 9 Sep 2010 14:22:43 
To: Tesla Coil Mailing List<tesla@xxxxxxxxxx>
Reply-To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] 8 inch tesla coil design

3.5:1 is ok.  4.5:1 will provide better performance.

I usually shoot for 10-12 turn pri, so you might wish to add a small amount
of capacitance, but your 14 turn pri should also work very well.

Dr. Resonance




On Wed, Sep 8, 2010 at 7:59 PM, <jeremyee@xxxxxxxx> wrote:

> Hey group. It has been a long time since I have been on here and I wanted
> to pass a design by you guys to see if I have anything weird. Below are some
> inputs to and outputs from TeslaMap:
>
> 15 kV, 120 mA NST bank
> 30 nF MMC
> 8.625 inch secondary with 1160 turns of #23 magnet wire (74 mH)
> 6 in by 30 in toroid (31.6 pF)
> Tuned primary at 14 turns for 112 uH
> Resonant at 87 kHz
>
> One of my main concerns is sizing the toroid for maximum breakout voltage
> but keeping the number of primary turns down to minimize resistive losses.
> At 14 turns I feel like I am a little too high. I am using a static gap with
> about 6 parallel copper couplings. My secondary aspect ratio is about 3.5:1
> (is this ok?). I really appreciate any insight into my design. Thanks!
>
> Jeremy
> Cincinnati, OH
> Sent from my BlackBerry device from Cincinnati Bell Wireless
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
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