RE: potential gain vs. power in TC systems

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Hooper, Christopher AZ" <christopher.az.hooper@xxxxxxxxx>

Good day great coilers,

I know Steve has built a DRSSTC magi, but I have not had an opportunity
to sit down and talk him about his results. I also know that Colin in UK
is working on a small one. My concern is the current is so high and the
voltage is low on DRSSTC, the flash over would be a handful. Major
insulation would be the focus between the primary and the first
secondary. I am working on the 48kva DRSSTC coil now,  if I can keep the
flash over in control, a big Magi DRSSTC would be a fun project indeed.
Would the extra work of a seconded secondary give longer sparks,
hmmmmmmm, that would have to been look at? Also another concern is I
plan on traveling with the big DRSSTC and more components to care for
would be a factor. I guess this will have to be a nice talk with Steve
Ward when I come to the Cheesehead thon, as our cell phone minutes are
burning now on the 48kva DRSSTC.


Cheers,
Christopher R.


-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Friday, April 07, 2006 10:15 AM
To: tesla@xxxxxxxxxx
Subject: Re: potential gain vs. power in TC systems

Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>



It's essential that the driver coil, ie, the first secondary inductor
has a very high Q factor to produce very high current output, so
essentially the driver secondary should be of a reasonably large
gauge fine stranded silver-tinned wire.  Example: 150 to 200 turns of
#10 or #12 AWG. Maintaining a high Q here is important to produce the
high drive currents that are required at the base of the resonator
(tiertiary coil, or "3rd coil").

The resonator coil does not have to have a high Q factor and is best
served with many turns of fine guage wire, ie, #28 or #30 AWG
wire.  This produces a high potential multiplication when base driven
with a high peak current. Richard Hull's design of this type using
#30 AWG wire produced 13 x sec coil length sparks.

I disagree with equal size wire guages on both driver and resonator
coils. The driver coil needs a larger dia. wire to develop the high Q
factor to produce the higher peak currents.  Even with RF currents
basic Ohm's Law still applies although more complex impedances also
enter the equation. Less resistance = higher Q = more current.

Has anone on the list (Steve Ward or Christopher Hooper are you
listening???) designed and built a solid state tiertiary coil
"magnifier" system?  With the incredible efficiency of solid state
switching it would be cool to see a DRSSTC magnifier type system run.

Dr. Resonance



----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, April 06, 2006 11:48 AM
Subject: Re: potential gain vs. power in TC systems


>Original poster: Steve Conner <steve@xxxxxxxxxxxx>
>
>Hi Paul, all,
>
>I would go one step further and say that anyone tuning a magnifier
>empirically would end up avoiding that condition by a country mile.
>If the entire output voltage appears across the extra coil at any
>time, then the extra coil would flash over before the system reaches
>the maximum "Watts number" it would be capable of with a tuning that
>gave a more even voltage gradient along both coils. So I believe
>Richard Hull's magnifier couldn't have been "correctly" tuned and
>would have self-destructed spectacularly if it was.
>
>My own current belief is that as long as you make the characteristic
>impedance of the resonator anywhere between 50,000 and 150,000 ohms,
>the coil will perform well. I used 50,000 for my last DRSSTC and it
>has produced sparks 4.3 times the length of its secondary.
>
>If I was constructing a magnifier I would make the secondary and
>tertiary of more or less the same diameter and wire gauge. To all
>intents and p urposes I would be taking a 2-coil system and cutting
>the secondary in two pieces. I would also use a DRSSTC driver to
>excite one of the two lower frequency modes, where the secondary and
>tertiary resonate together almost as if they were a single coil, and
>avoid the higher frequency mode that (AFAICS) generates a lot of
>voltage on the transmission line without contributing much to the
output.
>
>I would also minimize the transmission line capacitance to keep this
>unwanted mode as far in frequency from the wanted one as possible.
>The idea would be to distribute the voltage evenly across the whole
>coil system and so get the highest output voltage before flashover.
>
>Steve
>________________________________________________________
>Probably true for most magnifiers. But if the system is tuned
>corre ctly for 'complete' energy transfer, the entire output voltage
>will appear momentarily across the 3rd coil: peak topvolts is tuned
>to occur at the same instant that the transmission line voltage is
>momentarily zero. That state of affairs is very unlikely to
>happen except by very careful design and tuning, so Steve's comment
>is fair.
>
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