Re: toroid size

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Gregory Peters by way of Terry Fritz <twftesla-at-qwest-dot-net>" <s371034-at-student.uq.edu.au>

Quoting Tesla list <tesla-at-pupman-dot-com>:
Dr Res,


> Original poster: "D.C. Cox by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>
> 
> 
> You need to tune this coil at 20% power WITH a breakout point.
>  Also, use
> around 30 turns of scrap wire for the primary.  Then you can
> get your
> parameters dialed in before going to high power.  Racing
> sparks are
> definitely a sign of not enough inductance available to
> properly tune the
> primary into syn with the sec coil.
> 
> This toroid will work fine but you need to tune it first
> having a lot of
> primary adjust available and set your sparkgap as close as
> possible so it
> fires smooth at 20% power so you can get the tuning right.
> 
> Dr. Resonance
> 

The primary taps at turn 7, out of an available 15 turns. The tuning 
seems accurate to within 1/3 of a turn.


Cheers,

Greg.