Re: toroid size

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

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




----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, September 29, 2002 11:37 AM
Subject: toroid size


> Original poster: "Gregory Peters by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <s371034-at-student.uq.edu.au>
>
> Hello all,
>
> Does a 12"x46" Al duct toroid seem too large for a 8-10kW 12"
> diameter coil running at 200BPS? That is what I am currently using,
> and the coil will not break out without a sharp point. If I remove
> the sharp point, the secondary gets severe racing arcs, so hot that
> the coil immediately is ruined and needs repairing (no sparks break
> out of the toroid). The coil makes over 10 foot sparks with the
> breakout point, and I would have thought it would have no trouble
> with a toroid this big, even without the breakout point. Ideas,
> suggestions? I'm thinking of switching to 100BPS operation, but I'm
> scared I'll fry another coil.
>
> Cheers,
>
> Greg.
>
>