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Re: Basic question regarding twin systems



Original poster: Kurt Schraner <k.schraner@xxxxxxxxxxx>

Hi Jon,

the calculations can be done exactly as you say.

The easiest way for phasing seems to me, winding all the coils in the same direction; then connecting the the primaries "inner to inner and outer to outer turn" (of course, inserting the cap in one of the lines). The primary connecting lines will add a small amount of offline inductance, which probably can be neglected.

One of my twin system can be seen at:
http://home.datacomm.ch/k.schraner/tc8sparks.htm

A 4.3MB PDF report of another one is at:
http://home.tiscalinet.ch/m.schraner/UBTT-Betrieb.pdf
(sorry, that one is in german language).

Best regards,
              Kurt

Tesla list schrieb:
Original poster: "Jon Danniken" <danniken@xxxxxxxxxxx>
Hello,
I've built a few single coils over the years, and am currently building a six inch coil. Because I am
planning the coil after that to be a twin system based upon this and another six inch coil, I have a
question I would like to ask before I wind the second coil.
I am familiar with the basic concept in a single coil system whereby the primary (tank) frequency matches
the secondary (coil + topload) frequency (IpCp = IsCs).
In a twin system, the Ip is split between two different primary coils (Ip1 and Ip2), with the fundamental
primary (tank) frequency created by both primaries and the main capacitor. Is this fundamental primary
(tank) frequency the same frequency that would normally drive either of the secondary coils individually
[((Ip1 + Ip2)Cp) = Is1Cs1] and [((Ip1 + Ip2)Cp) = Is2Cs2]?
In other words, can I just design for a single coil system, but split the primary between two inductors
and add an additional secondary? Thusly, if the primary (tank) frequency is 110 kHz, will each secondary
also be 110 kHz?
Sorry for the simplistic descriptions here, and I do realize that either one of the secondaries or one of
the primaries needs to out of phase for the two coils to interact.
Thanks,
Jon