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Re: High Inductance Secondaries and DRSSTCs
Original poster: "Steve Ward" <steve.ward-at-gmail-dot-com>
On Thu, 09 Sep 2004 07:42:25 -0600, Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Eastern Voltage Research Corporation"
> Does anyone remember the discussions that were awhile back regarding high
> number of turn secondary coils???
No, but i assume some people would worry that it spoils the Q due to
> I'm currently designing my secondary coil for my "Psychosis Coil" which will
> be 48" winding length, 25 AWG, on a 12.5" Dia.
> coilform. About 2700 total turns. Total Ls of the secondary is about 440mH
> and resonant frequency of the entire secondary / toroid assembly is about
Sounds good to me. Thats like my coil, just much larger diameter. I
used 26 awg on an 8" form and 45" tall.
> Right now, the only bad thing about this is i will need a larger number of
> primary turns to get down to the resonant frequency I want (i plan on using
> about a 0.3 to 0.4uF primary capacitor)
I think you can perhaps go to maybe .45uF. The .36uF im using now
seemed to work the best for me, but your coil is both larger and a
lower frequency, so i think you will want a suitably larger capacitor.
And you're using bigger IGBTs ;).
> Anyone else see anything troubling with my secondary??? I can't. I should
> have probably used a larger gauge wire (maybe 22 AWG), but i just bought
> a 68 LB spool of this 25 AWG stuff.
I think it should work fine. For a SGTC it might not be optimal, but
secondaries like this seem to work fine on DRSSTCs.