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LAN_403

Arcstarter

Sat Jun 27 2009, 04:13AM

Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253

Looks very nice, it is a very impressive piece of work!

Here is a noobish question. The six gauge primary was overheating, Six gauge wire is good for approximately 100 amps. I would have figured the wire was getting so hot from high RF current. But as you said, your tank capacitor is rated for 24 amps RMS, and you said "it would take alot to heat this puppy".

That made me think it was not just RF current, but maybe eddy current. So my question is what is making such thick wire heat so much?

Dr. Drone

Sat Jun 27 2009, 04:21AM

Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
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Posts: 1673

Arcstarter

Sat Jun 27 2009, 06:19AM

Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253

Dr. Spark wrote ...

Arcstarter wrote ...

Here is a noobish question. The six gauge primary was overheating, Six gauge wire is good for approximately 100 amps. I would have figured the wire was getting so hot from high RF current. But as you said, your tank capacitor is rated for 24 amps RMS, and you said "it would take alot to heat this puppy".

That made me think it was not just RF current, but maybe eddy current. So my question is what is making such thick wire heat so much?

Good question.

Skin effect. Next VTTC will use copper tubing. Only issue is need more room for primary. RF current is much higherâ€¦.on the primary. FATBOY runs around 4,000 RF amps, that is why Â½ pipe was running hot to the touch at the thon and melting the plexy.

The current is from each tube, plate max of 500ma x 4. So, the tank cap will have to process the 2amps.

Rgs,
Dr. Spark

That makes sense :D.

But the tank cap only sees the current of the tubes? I figured higher currents than what the tube sees would be flowing through the primary and tank cap. Seems like the current would be higher due to the primary and cap resonating or something.

Nice to know :D

Dr. Drone

Sat Jun 27 2009, 07:39AM

Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
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Posts: 1673

teravolt

Sat Jun 27 2009, 06:24PM

Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111

Dr. Spark I am thinking that your 2 AWG wire is partly responsible for larger sparks. I have been told that VTTC's use lots of turns to keep the current down on the tube and make the overall primary tank impedance up but you have been stedaly reducing the gauge No. more like a regular tesla. What I am geting at is that your circulating current is going up and your system efishency is also going up because your loses in the primary are less so the tubes work less. as your XL/r, Q, go up on the primary your tubes will work less to a point maby 6-8 turns. As the primary Q goes up your tuning will be harder because your upper and lower poles will sharper. your VTTC is becoming more like a 445KHz vacuum tube duble resonant tesla coil, VTDRTC. What do you think

Dr. Drone

Sat Jun 27 2009, 10:15PM

Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
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Posts: 1673

teravolt

Sun Jun 28 2009, 06:12AM

Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111

like all resonant transformers frequency spliting is takeing place. if you know anybody who has a spectrum analyzer or if you have a scope with FFT you should be able to see it. If Q in the primary or secondary and or coupling goes up the peaks will move farther apart and get narower and you should get bigger sparks. I am thinking that your sparks could hit the ground at full power.

I am begining to think that a VTTC's primary could be the same in amount of turns and gauge as a standard tesla and that more turns are losy and have more harmonics. Tonskulus and you has prooven that

this works good if the caps in the primary are lower ESR and low los caps like mika door knobs and poly as you know

Dr. Drone

Sun Jun 28 2009, 09:21AM

Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
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Posts: 1673

Dr Hankenstein

Sun Jun 28 2009, 10:03AM

Registered Member #1642 Joined: Sun Aug 17 2008, 11:36PM
Location: Black Canyon City
Posts: 96

You're still up at this hour????

Henry

teravolt

Sun Jun 28 2009, 03:03PM

Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111

nice picturs, I think your mesuring the lower pole witch should be less than the fundimental. needless to say the sparks are still sword like at 372k

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