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Registered Member #2909
Joined: Wed Jun 09 2010, 12:31AM
Location: fort belvoir, Va USA ( south of DC)
Posts: 145
I am just courious if there is a major difference between a cone shape seconary and the more common cylinder alot of the demo TC like this one are cone shape, so why is that? is there an advantige to having a cone secondary or what?
Registered Member #3505
Joined: Sun Dec 12 2010, 06:03AM
Location: Albuquerque NM
Posts: 108
Telsa had a ton of conical coils and the idea was that towards the top where the voltages are higher it would have less resistance. I've seen tons of post on this subject on pupman but never a clear cut winner but I have a cone form that I'm prepping currently for some Litz wire. It should be interesting.
Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
Registered Member #1642
Joined: Sun Aug 17 2008, 11:36PM
Location: Black Canyon City
Posts: 96
Conical shaped tesla coils are indeed a bit more of a challenge than a conventional cylinder. I started at the small end with a few turns and dabbed small bits of epoxy to the wire, let it dry somewhat and continued to wind. The epoxy helps reduce the tendency for the winding to suddenly become loose (as it did the first time I tried it!)
Below is a photogragh of the finished coil. It is audio modulated, SSTC, PLL controlled frequency, secondary CT feedback (this greatly improves the length of the arc and quality of sound). Secondary measures 8" at the bottom, 7" at the top and is 9" long. Wound with #31 AWG, the fo=138khz with an 8" corona ring.
Driver circuitry is a hybrid of Steve Conner's and Uzzor's with additional CT feedback scheme. Output is full bridge MOSFET Chris Hooper design. Runs at 5amps with 200VDC on the buss. Sparks vary between 3" and 5" depending on music program and audio input drive.
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Conical or cylindrical Secondarys
