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Re: Photos of 8 kVA twin coil (fwd)

Original poster: List moderator <mod1@xxxxxxxxxx>

---------- Forwarded message ----------
Date: Wed, 23 May 2007 12:37:20 -0800
From: Greg Leyh <lod@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: Photos of 8 kVA twin coil (fwd)

Hi Finn,

There are small breakouts (about 1/8") on each toroid, set to break at 
about 95% full drive.  Without the 1/8" breakouts, the toroids allow no 
spark!  As the design evolves, the entire equator of the toroids will be 
equipped with active breakouts, which can be activated and deactivated 
at will.

Each primary drive is completely independent.  The two drives can 
operate at any relative phase, and even at different break rates.  
Connecting the two primaries together from a single drive would result 
in excessive transport losses.  The drives are identical and 
interchangeable, since both secondaries resonate at 60.25 kHz.

Yes, each primary is a single turn.  In fact, the transverse component 
of the conductors inside the driver circuitry make up about 20% of the 
effective primary loop.  This design also uses the Regenerative Tesla 
Coil scheme described earlier, where the remaining ringdown energy in 
the secondary is recovered back to the primary capacitor, after the 
secondary voltage decays to the point where it no longer contributes to 
the streamer growth.


>---------- Forwarded message ----------
>Date: Wed, 23 May 2007 06:57:01 +0200
>From: Finn Hammer <f-h@xxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Re: Photos of 8 kVA twin coil (fwd)
>Nice to see the scaled down ALF twins in action. Cool, rugged secondary`s!.
>A couple of questions:
>Have you got breakout points on those gorgeous toroids?.
>Are you gating 2 separate, identical coils at the same time, so that 
>they are free to settle on each their own frequency, or are the primary 
>coils connected in a common loop, to ensure solid anti-phase operation?.
>Am I seeing a 1-turn primary?.
>Cheers, Finn Hammer
>Tesla list skrev:
>>> Original poster: List moderator <mod1@xxxxxxxxxx>
>>> ---------- Forwarded message ----------
>>> Date: Tue, 22 May 2007 00:32:08 -0800
>>> From: Greg Leyh <lod@xxxxxxxxxxx>
>>> To: tesla@xxxxxxxxxx
>>> Subject: Photos of 8 kVA twin coil
>>> Hi All,
>>> I didn't take any photos of the Maker Faire event but here's a few that 
>>> have surfaced on the Web, which are usually better quality than I could 
>>> produce anyway.  This was a daytime event, and though the ambient 
>>> lighting washed out most of the finer streamers, the event offered an 
>>> opportunity to shake down the system for the first time and explore some 
>>> of the interesting twin coil dynamics.
>>> It was a pleasant change of pace to setup and run a simple coil system 
>>> where everything is hand-carryable. The two coil structures stand about 
>>> 10ft high and 18ft center to center.
>>> Here's the power supply and timing controls:
>>> http://tinyurl.com/2gvrg6
>>> Mulling over waveforms with a few visitors:
>>> http://tinyurl.com/25ejvr
>>> Here's a pic from the one time we were able to dim a few courses of lights:
>>> http://tinyurl.com/27dbbm
>>> Here's a closer view of the arc structure:
>>> http://tinyurl.com/2btyup
>>> And here's a video clip of the coils operating.  Again, sorry about the 
>>> ambient light!
>>> http://www.youtube.com/watch?v=zQ2oLQ2ZEnc