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Re: Twin coils - PSpice model development



Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz <teslalist-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>

Tesla list wrote:
 >
 > Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
<Rscopper-at-aol-dot-com>
 >
 > To all of you that have built a twin coil system:
 >
 > I'd like to get a good PSpice model developed for twins.  Have any of you
 > done measurements of resonant frequencies while the secondaries are not
 > arcing together vs. when they are arcing together?  I haven't been able to
 > capture much on a scope to develop a good theory.  Anyone have a spectrum
 > analyzer I could borrow?

Basically, the primary side has a capacitor and two inductors in series.
The two secondaries are grounded inductors in parallel with capacitors.
The primary inductors are coupled to the secondary inductors, one to
each. Add resistors if you want a less ideal model. Start the simulation
with an initial voltage at the primary capacitor, if you just want to
see the energy transfer.

 >  >From my observations with my Twins, I think the secondaries operate at
 > multiple frequencies depending on coupling to closest primary, coupling to
 > other secondary, and whether or not the arcs connect between secondaries.

The circuit described above oscillates at 4 frequencies if the
secondaries
are disconnected (no spark) and at 3 frequencies when they are
interconnected by a short-circuit (ideal spark). If the system is tuned,
cancellations shall reduce the oscillation frequencies to 2 and 1,
respectively.

Antonio Carlos M. de Queiroz