On Thu, 29 Aug 2002, Scott Touchton wrote:

>Yup... and that is what I will do.  But I do have some questions dealing
>with the permeability of the core, and if it is gapped.   I should be able
>to spot this in the leakage inductance though.  But the true magic is in how
>they can sustain 12Kv without being vacuum potted.

No magic, just potting. color monitor fbt's provide 25kV dc from less than
2 cu.inches without problems. A photoflassh contains a tiny tiny pulse
transformer that does 6-8kV without problems. This is not so hard. I once
made ignition coils for small model engines and besides removing air from
the things and keeping the thin wire in one whole piece over 10,000 turns
there were no problems. My coil was the size of a AA battery but shorter.
I boiled it in transformer oil instead of potting (not really boiled,
just heated for a long time to ~150C).

Breakdown in air is about 1mm/kV at the range of voltages you are
contemplating so it should be do-able within 13mm^3 without potting. With
potting the theoretical limit could be ten times lower per side (1000
times less in volume).

Peter

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