Re: [TCML] DC Coils

[Scott Bogard <sdbogard@xxxxxxxxx>]

Hi Carlos,
     Having never built a DC coil you should probably ignore me, but if I
had to guess I would say your doubler is limiting your current.  If you can
vary your spark gap speed you can determine if this is the issue, if a
faster break rate improves performance, current is not an issue, it was a
calculation error, if it worsens performance, I would guess your current is
being chocked by the doubler.  Again, probably best to ignore me, I've
never built a DC coil, but you are correct for similar power levels results
should be the same...

Scott Bogard.

On Tue, Jan 10, 2012 at 2:27 PM, <lightningfor@xxxxxxxxxxxxxxxxxxxxxx>wrote:

> Hi List,
> I recently finished my first DC powered SGTC.
> I was surprised by the size of capacitor needed to produce a given spark
> length.
> The information I used was gathered from Richie Burnetts web site, and I
> am confident that I correctly understand the information
> and formula's presented on the page.
> My assumption was that I could choose a capacitor value, break rate, and
> charging voltage the same as my large AC fed coils, and I would get a
> similar performance in terms of spark length and power input.
>
> The result I got was quite different... I used 10kv DC input (so 20KV
> after doubling) and a 0.07uF cap with breakrate of 180bps.
> With my large AC coil I am getting 16ft arcs with 20kv AC RMS (so i guess
> 28kv peak), same cap and bps.
> With the new DC coil, only getting 5ft arcs. Power draw is low, and RSG is
> clean running.
> This all equates back correctly to the formulas in terms of BPS, input
> volts and cap size giving a specific power draw....  I just don't
> understand why my AC coil draws 3-4 times the power and produces 3 times
> the arcs, when the cap  size and break rate is the same.
> Sure, the peak voltage input is a bit higher, but not 3 times as high...
>
> Any comments...?
>
>
> Carlos
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