Re: Tiny TCs

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

Original poster: "Dr. Duncan Cadd by way of Terry Fritz <twftesla-at-uswest-dot-net>" <dunckx-at-freeuk-dot-com>

Hi Steve, All!

>What is the list's experience with tiny TCs?  I am talking about
secondaries
>wound with 30 gauge or smaller wire and less than two inches in
diameter.
>(Smaller than Brian Basura's good performing mini-twin.)


1 1/8 diameter x 7,5 inches long, 38AWG / 42SWG / 0,1mm double silk
covered enamelled wire wound on cardboard tube and impregnated with
molten beeswax, 1 inch diam brass drawer knob topload, Fres ~ 1,5Mc/s
(spaced winding) ca. 700-800 turns, 15W EHT input with 1nF primary
cap, 2 inch sparks.

>If TCs scale down OK and still maintain efficiency, seems like one
could
>still get a 10 inch discharge from it, or perhaps 18 inches from
bipolar
>twins.


With more power it probably would scale well, I have another
secondary, wound with the same wire, 1500 turns, 9 x 2,5 inches (OK, a
fraction bigger than your specs, and this one is close wound) with a 3
x 1 "toroid" without the hole in the middle turned from solid brass,
but my 15W homebrew induction coil is not meaty enough to drive it
well.  It probably needs a good 50W and a bigger primary cap to make
it do the business.

Dunckx