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Re: Extra coil and corona on connection wire
Hello Don,
A three coil system will not work well the way you are going about it. You
need to make a driver, that consists of your primary tightly coupled to
your secondary (the hardest part), try a secondary about 8" diameter with
5-10 mH inductance (use #18 wire), coupling >0.4. The existing secondary
should work well as the "free resonator", or third coil, I am assuming it
has >30 mH inductance. Use 3/8" copper tubing to couple the driver to the
"free resonator", or 12 gauge wire, or whatever. If you still have corona
problems use a small toroid on the top of the driver and one at the base of
your resonator. But with your power level you shouldn't need them. Good luck.
Regards,
David Trimmell
At 05:14 PM 9/16/1999 , you wrote:
>Original Poster: Don Allen <dona-at-amigo-dot-net>
>
>
>Hi All,
>
>I made a second coil that matches my first coil in size
>(6" secondary), coilform length, wire, etc. My thinking
>was to use it as an extra coil.
>
>I removed the topload off the main coil, and used AWG 22
>to connect the main coil to the bottom of the extra coil. Fired
>it up and got no spark, even after I ran out of primary turns
>(16). I decided to hook up the other .01 mfd cap in parrallel
>to get .02 mfd, and finally was able to get spark out of the
>extra coil doing it this way. The streamers were OK, but
>not all that impressive. I got corona the entire length of
>the connecting wire (about 8 feet between the two coils)
>on magnet wire. I tried a section of NST HV wire and it
>gave off corona the entire length as well, plus the HV
>from the main coil actually punctured the HV wire in two
>places!
>
>I may not have enough power to run the extra coil
>with only a 15/60 but it was an interesting experiment.
>
>What kind of wire is used to connect the extra coil without
>corona being a problem?
>
>Don
>
>
>http://www.fwpd-dot-net/dona/tesla/teslacoil.htm
>
>