Re: More Mini Coils

From: 	Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: 	Sunday, June 22, 1997 5:27 PM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: More Mini Coils

Hi Ed, all,

> From:   Alfred A. Skrocki[SMTP:alfred.skrocki-at-cybernetworking-dot-com]
> Sent:   Wednesday, June 18, 1997 7:29 PM
> To:     Tesla List
> Subject:    Re: More Mini Coils
> Wednesday, June 18, 1997 1:01 PM Edward V. Phillips
> <ed-at-alumni.caltech.edu> wrote;
> >  I have a rather small coil here, running off a 12 volt
> > battery with a transistor interrupter.  I get 4.5" streamers
> > when the input current is about 2 amps, so results are almost 
> > identical to Malcom's.
> Could you give a more detailed description on that coils specs?
> > Interesting thing........  If I turn the coil on in the dark, there
> > is almost no discharge visible from the 2.5" toroid.  As the seconds
> > go by the discharge increases until there is a beautiful purple crown
> > coming off the terminal.
> Sounds like a resonant build to me; think of the resonant circuit of 
> the secondary like a swing being pushed by the primary, with each 
> properly timed push the swing will go a little higher until eventualy 
> it will be at full swing.

My explanation: ion buildup at the terminal. The swing isn't going to 
swing at any great height for long once a discharge pours off the 
top is it? Consider how exact the phasing of successive primary shots 
would have to be and how high the break rate would have to be for the
secondary to be swung up in the manner you suggest. I tried doing 
this once using MOSFETs driven by a precision pulse generator in place 
of the gap. Break rates in the thousands + some very accurate pulse 
width setting was required, and that was with next to no loading. 
Compare the use of such an instrument with the typical firing 
precision of a spark gap.