Re: [TCML] VTTC-tuning. John got me started ;-)

["Dex Dexter" <dexterlabs@xxxxxxxxxxx>]

Some additional questions about VTTCs:

1. Is there something similar to Freau's spark lenght-power input formula for VTTC
making swordlike sparks?Or do VTTCs reach almost max spark lenght for only 1 semicycle
of 60 hz excitation?

2.Why usually small toroid on the top of VTTC secondary instead of comparatively bigger one
  used for spark gap tesla transformer?

3.Is this a good formula to roughly estimate top volts:

0.5*L*di/dt < V < L*di/dt

where i denotes secondary base current ,L low frequency secondary inductance,t time.

4.Where to find recommendation "wire gauge vs power input" for VTTC?


Thanks for replies.

Dex  

--- futuret@xxxxxxx wrote:

From: futuret@xxxxxxx
To: tesla@xxxxxxxxxx
Cc:
Subject: Re: [TCML] VTTC-tuning. John got me started ;-)
Date: Wed, 01 Apr 2009 19:01:46 -0400

Christoph,

I don't know of any proof.  It's possible that the secondary Q
may be important also.  The low frequency coils might often have
thin wire and a poor secondary Q.  This may make the sparks fuzzy,
I don't know.

I know for sure that other factors also make a big difference for
sword-like vs. bushy spark.  Factors such as; tuning, grid feedback,
coupling, maybe tank Q, etc.  But some coils seem to produce
the sword-sparks much more easily than others.

John


-----Original Message-----
From: Christoph Bohr <cb@xxxxxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Wed, 1 Apr 2009 9:40 am
Subject: Re: [TCML] VTTC-tuning. John got me started ;-)



Hello Roger, all.

> It seems
> that most people prefer the sword like sparks these days and as I
> understand
> it, that requires the coil to resonate above 300 KHz.
I read that, too, on Steves Website, but he himself states that he only
believes there could be a connection, there is no proof, hovever.
Or are there any hard facts concerning this point?

regards

Christoph Bohr


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