Re: General Coil Design

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Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net> 


Hi Paul,

Two question when choosing a top load.

1.  For a toroid, what is the dependency of breakout on major diameter (or
is it mostly minor diameter) and is there data available for different
toroid sizes or a rule of thumb.  I have heard estimates of 71KV per inch of
minor radius but this seems to be off by a factor of two so I'm wondering if
71 KV per inch of minor diameter is correct?

2. Given a toroid with a certain breakout voltage,  if JAVATC (with this top
load) calculates a topload voltage above this (but not "vastly higher"),
would this be the correct methodology?

Thanks

Gerry R
Ft. Collins, CO

BTW, I got the Unix emulator up and running, so now I can start writing some
C code.

 > Original poster: Paul Nicholson <paul-at-abelian.demon.co.uk>
 >
 > The secondary is merely a secondary consideration, IMO, and should
 > be selected so that the chosen topload is charged up to a potential
 > comfortably above the topload's breakout voltage, but not vastly
 > higher.  That consideration will set the required secondary self-
 > capacitance (for a given bang energy and a guess at RF transfer
 > efficiency), and since you've already chosen a primary C value,
 > that then sets the ratio primary:secondary inductance.  The final
 > step would be to choose some secondary inductance that gave you
 > a reasonably practical primary coil, with not too high an Fres.

 > Paul Nicholson,
 > Manchester, UK