Re: secondary coils

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

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

Tesla list wrote:
> 
> Original poster: "Jason Matlock by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <matlockjm-at-mediaone-dot-net>
> 
> I think you are referring to the primary coil, and yes they are very
> neccessary.  If you have read up on the theory and physics behind the tesla
> coil, you would see that they work because a magnetic field is created in
> the primary coil and when it collapses around the secondary coil, it creates
> an electric charge which is significantly higher than the primary coil's
> because of the turn ratio . If you only have one coil, then you are missing
> the step up transformer affect and don't really have a tesla coil.

This explanation is not exactly correct. A Tesla coil is not a "flyback"
transformer circuit, as an induction coil. It's more like two coupled
pendulums, where the oscillations that start at one pendulum are
gradually
transferred to the other. The two pendulums in this case are two
resonant
circuits of different impedance levels, so a high-current, low-voltage
oscillation in the primary circuit is converted into a high-voltage,
low-current oscillation in the secondary.

Several combinations of two coils and two capacitors can be made to have
this behavior, and a transformer is -not- necessary. For example, the
secondary coil can be away from the magnetic field of the primary
circuit,
directly connected to its top by a wire, with the bottom of the primary 
coil grounded. This system works exactly as a Tesla coil when properly
adjusted.

Antonio Carlos M. de Queiroz