Re: Basic question regarding twin systems

["Tesla list" <tesla@xxxxxxxxxx>]

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