Re: coil setup

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

Original poster: "Antonio Carlos M. de Queiroz" <acmdq-at-uol-dot-com.br> 

Tesla list wrote:
 >
 > Original poster: Jimbo07031982-at-aol-dot-com
 >
 > Would connecting the secondary to the primary cause any adverse effect's in
 > the performance of a coil?

You can do this directly if your power supply has one side grounded.
One the side of the primary coil must be grounded for this connection.
It's possible to connect a center-tapped NST to a grounded primary coil
if the primary capacitor is split in two, one in series with each
output line of the NST. Just split an MMC capacitor in two, each
with twice the total capacitance.
Have in mind that this connection is somewhat dangerous, because if
the RF ground connection fails the low-frequency high-voltage from
the power transformer is present at the output.

If the secondary and primary coils are arranged so the primary voltage
adds to the secondary voltage, the connection increases the effective
coupling coefficient of the system, increasing the efficiency.
If the connection is opposite, the effective coupling is decreased.
See: http://www.coe.ufrj.br/~acmq/tesla/tefp.html

Antonio Carlos M. de Queiroz