Re: statur report

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: robert heidlebaugh <rheidlebaugh@xxxxxxxxxxxxxx>

David: As my social security no longer suports my big projects I
disassembeled my big  DC supply using 1 Farad aircraft photo flash
capacitors as this was dangerous to work around. My large DC suply now uses
only 3 - 5 Mfd 60Kv  160 lbs high discharge capacitors in a double Pi
network with two 26 turn toroid chokes wound with # 6 high voltage wire.
This one is powered with a bridge rectifier and a 1K 100w surge resistor.
While not near as dangerous as my big one any stupid mistake would be final.
      To answer your next question ,NO I do not use discharge resistors. I
use a seperate switch in discharge load that will disipate 5 Kw and use
shorting wires when not in use. My small play around Dc supply uses  10 Mfd
radar transmitter in series for 2 Mfd total and 33 meg discharge resistors
This is lethal but not as dangerous as my medium power suply as it will pop
a #12 wire like a m80 fire cracker. At  Mc Clelam AFB a workman shorted a 1
farad photo flash capacitor like I used with a wrench and vaporized his arm
and wrench from the elbow down so I am aware of the potential danger of high
voltage and high capacitance as I have played in this area profesionaly
since 1958 and while I am on soc sec. I have not stoped my research.
   Robert    H
--


> From: "Tesla list" <tesla@xxxxxxxxxx>
> Date: Wed, 28 Dec 2005 16:29:14 -0700
> To: tesla@xxxxxxxxxx
> Subject: Re: statur report
> Resent-From: tesla@xxxxxxxxxx
> Resent-Date: Wed, 28 Dec 2005 16:24:13 -0700 (MST)
>
> Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
>
> Hi Robert,
>
> Yes, you seem to have gone DC without an absolutley
> HUGE filter cap (2 uFd) but you still pretty much make
> my point, as 2 uFd is still 20x larger than .1 uFd and 2
> uFd at 22 kV makes for 484 J. That's still a very lethal
> level of stored energy to have to worry about properly
> bleeding off after powering the coil down. I am surprised
> that you are able to get by with only 15 turns of house
> wiring around a 1" diameter X 6" long form for your choke
> though. BTW, what size is your DC system?
>
> David Rieben
>
> ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Wednesday, December 28, 2005 1:28 PM
> Subject: Re: statur report
>
>
>> Original poster: robert heidlebaugh <rheidlebaugh@xxxxxxxxxxxxxx>
>>
>> David : I have DC TC coils with 1/2 wave rectifiers and small filters of
>> only 2 MFD. A shohe coil is esential but it may be small inductance. I use
>> 15 Turns of house wire 1 in diameter and 6 in long air core. The inductance
>> is low but it works. The large size is for insulation at 22Kv to prevent
>> turn to turn arcing.
>> Robert   H
>> --
>>
>>
>>> From: "Tesla list" <tesla@xxxxxxxxxx>
>>> Date: Tue, 27 Dec 2005 18:17:46 -0700
>>> To: tesla@xxxxxxxxxx
>>> Subject: Re: statur report
>>> Resent-From: tesla@xxxxxxxxxx
>>> Resent-Date: Tue, 27 Dec 2005 18:14:20 -0700 (MST)
>>>
>>> Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
>>>
>>> Justin,
>>>
>>> To build a DC Tesla system "right", you are going to need
>>> some really BIG filter capacitors! I'm talking like quarter
>>> shrinker/can crusher sized caps! Then of course you'll al-
>>> so need to make sure that you have an adequate inductive
>>> reactor to keep all of the filter cap(s)' energy from trying to
>>> flood the spark gap and damaging or destroying the other
>>> tank circuit components. 0.1 uFd isn't nearly enough capacitance
>>> for a FILTER cap for even a small DC resonant Tesla coil sys-
>>> tem. Think 10's of uFds. Others that aren't as numerically
>>> challenged as myself can run the numbers and formulae for
>>> you.
>>>
>>> Having said all of that, it should be quite apparent that a
>>> typical AC Tesla system is considerably simpler to build and
>>> you get about the same performance per input power, so
>>> why bother with the extra labor, time and co$t of building
>>> a DC system unless you just want to meet the challenge?
>>>
>>> David
>>>
>>> ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
>>> To: <tesla@xxxxxxxxxx>
>>> Sent: Tuesday, December 27, 2005 1:18 PM
>>> Subject: statur report
>>>
>>>
>>>> Original poster: Just Justin <rocketfuel@xxxxxxxxxxxxx>
>>>>
>>>> Greetings,
>>>>
>>>> After a long period of research, I've finally started building my
>>>> first coil.  I must say, I was inspired by Malcolm's speed and so
>>>> I've set my sights on having something to show my friends on New
>>>> Year's Eve.  It will go well with the fireworks and flamethrowers.
>>>>
>>>> Anyway, my first source of good information was Richie Burnett's
>>>> wonderful site, which made me want to go straight for a DC
>>>> resonant system right away.  After thinking it over, I decided
>>>> that going DC resonant with my 12KV NST would require a very
>>>> high voltage tank cap and that I'd be better off using MOTs due
>>>> to their lower voltages.  In the meantime, I thought I'd try a
>>>> NST-bridge-filter caps DC system.  I built a propeller gap but
>>>> have had some alignment issues due to the way I constructed the
>>>> rotor, so I've shelved that and made a 6-segment (1"x6") copper
>>>> tube fan-blown gap.  Now if you're still reading I'm sure you're
>>>> probably going to say that there's no point in DC with the static
>>>> gap and I'm mostly convinced myself.
>>>>
>>>> However, when constructing the fan blown gap, I observed it as
>>>> NST + bridge, and again as NST + bridge + filter caps and saw very
>>>> different sparks.  Without the filter caps, the gap frequency was
>>>> very high, and the sparks were purple-orange, and they seemed to
>>>> persist as the fan blew them to the far side of the pipe.  With
>>>> the filter caps (0.1 uF) in place, the gap fired much less frequently
>>>> and the sparks were white and seemed "hotter".
>>>>
>>>> Of course this had me scratching my head.  My current theory is that
>>>> with AC and a static gap, the gap might break down several times during
>>>> the portion of the AC wave that is of a higher voltage than the gap
>>>> can withstand before breaking down.  With the NST + bridge only, this
>>>> would be more or less the same situation, but without the
>> reversing polarity.
>>>> With the addition of the filter caps though, I imagine that the filter
>>>> caps take a wee bit of time to 'fill' to the threshold voltage of the
>>>> gap, and when they do discharge, they add to the NST's current,
>> leaving >> the
>>>> cap's voltage after the spark somewhere between 0 and the gap
>>>> threshold voltage.
>>>> Once the plasma has been created, resistance goes down and so
>> I'd >> imagine
>>>> they are somewhat depleted after the spark.  Then the cycle repeats.
>>>> I guess the question is how long does it take the filter caps to charge
>>>> to the gap voltage and is that longer than 1/120th of a second?
>>>>
>>>> My assumption is that any energy I might be storing in the filter caps
>>>> is just going to drain out through the spark gap, and therefore is
>>>> pretty much useless without the accompanying charging reactor and D-Q
>>>> diode of a full DC resonant charging system.  I still don't entirely
>>>> understand why the filter caps would not discharge through the spark
>>>> gap in a resonant system, except that possibly the charging reactor
>>>> limits the current out of the filter caps.
>>>>
>>>> I have a few specific questions that I'll post in seperate emails.
>>>> Thanks for reading and I'll appreciate any comments y'all might have
>>>> to offer.
>>>>
>>>>
>>>> Justin in Austin
>>>>
>>>
>>>
>>>
>>>
>>
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