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RE: [TCML] Climbing Arcs
Wow David,
That's pretty cool (hot). I have a 150kv GE / 600ma. How much power were you
running? I haven't fired mine up yet. I have a 300amp dialarc sat reactor
Miller (90amps@ 240 max) welder for the power control.
Jim Mora
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of David Rieben
Sent: Thursday, May 29, 2008 1:07 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Climbing Arcs
Hi Bert,
Yes, the transformer itself is all that's driving this JL - no
additional capacitance than the natural parasitic capaci-
tance of the transformer's internal wiring itself. It's not at
all hard to "start" a JL with >100 kV of available firing
voltage ;^) The "starting point" of this JL is about 8 1/8"
apart!
David Rieben
----- Original Message -----
From: "Bert Hickman" <bert.hickman@xxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Thursday, May 29, 2008 10:08 AM
Subject: Re: [TCML] Climbing Arcs
> Hi Tony,
>
> The video that David Rieben discussed in his latest post shows similar
> "snappiness" to the arc.
>
> http://www.youtube.com/watch?v=0dLTEOM3qQc
>
> The higher voltages of X-ray transformers increases the effect of
> parasitic capacitance on Jacobs Ladders, making them sound quite nasty
> even without any other lumped C across the gap. A small HV cap across the
> gap in an NST also helps raise the open circuit voltage, making it easier
> to restart the arc at the base of the ladder. It's a bit harder on the NST
> however.
>
> Re: coins & Stuff - they are an oddity for sure. BTW, we'll be appearing
> in an upcoming issue of Coin World Magazine, and our Lichtenbergs are now
> on the cover of the latest Edmund Scientific catalog.
>
> Do you still making Geissler tube replicas? The one you traded for is
> still very beautiful!
>
> Best wishes,
>
> Bert
> --
> ***************************************************
> We specialize in UNIQUE items! Coins shrunk by huge
> magnetic fields, Lichtenberg Figures (our "Captured
> Lightning") and out of print technical Books. Visit
> Stoneridge Engineering at http://www.teslamania.com
> ***************************************************
>
> Sfxneon@xxxxxxx wrote:
>> Hello Bert,
>> Appreciate all the suggestions! I really like the one about using a
>> small capacitance across the secondary to add a little SNAP! I'll give
>> it a try. Do you still have that xenon plasma tube that I traded to you
>> for the shrunken coins? I still have the coins and they never fail to
>> amaze people!
>> Thanks,
>> Tony
>>
>> In a message dated 5/27/2008 10:04:02 A.M. Central Daylight Time,
>> bert.hickman@xxxxxxxxxx writes:
>>
>> Hi Tony,
>>
>> Some suggestions:
>>
>> 1. Use a wide "V" to more rapidly spread the arc. The higher the current
>> the wider the end gap should be
>> 2. Use inductive ballasting for best performance
>> 3. Use smooth rails to avoid incandescent "hot spots" that will cause
>> the arc roots to temporarily hang in one spot. I'd recommend using 3/4"
>> hard copper pipe or non-magnetic stainless steel tubing. Periodically
>> remove any oxide buildup. I suspect the oxidation of the galvanizing may
>> a major part of the problem you're seeing.
>> 4. Enclose on 4 sides to reduce disruption by air currents. Leave top
>> AND bottom portion open to permit vertical air flow. Be sure to leave
>> plenty of clearance on either side of the gap, especially for a higher
>> current ladder.
>> 5. For grins, try connecting a small (500 - 1000 pF) HV doorknob cap
>> across the gap to make for "snappier" performance at start and at long
>> arc lengths.
>>
>> Good luck,
>>
>> Bert
>> **************Get trade secrets for amazing burgers. Watch "Cooking with
>> Tyler Florence" on AOL Food.
>> (http://food.aol.com/tyler-florence?video=4&?NCID=aolfod00030000000002)
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>>
>
>
>
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