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4hv.org :: Forums :: Tesla Coils
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PlasmaSonic II based SSTC, with poor performance

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Tom540
Thu Oct 02 2008, 12:37AM
Tom540 Banned on 3/17/2009.
Registered Member #487 Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617
Dr. Spark wrote ...

I have and so have a few coiler frends, so why take the chance? rolleyes

Cat5 is definitely easier and more convenient but I think it's just sort of misleading to say magnet wire is going to fail no matter what or that its totally shitty. I use them both smile
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Dr. Drone
Thu Oct 02 2008, 01:44AM
Dr. Drone Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
Location:
Posts: 1673
 		shades
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teslacoolguy
Thu Oct 02 2008, 01:54AM
teslacoolguy Registered Member #1107 Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
 		I use cat 5 just for the simple reason that it is very easy to identify the windings.
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Cotlone
Thu Oct 02 2008, 09:20AM
Cotlone Registered Member #1383 Joined: Mon Mar 10 2008, 11:09AM
Location: Wollongong, NSW
Posts: 27
 		I've connected up my new GDTs as you can see. They seem to function a bit better than the old ones, though still nothing too exceptional, the output is an arc of at the best 45mm.

Could it be that my discharge terminal is poorly designed and is preventing corona discharge? I removed the small ball and this left a thread rod which i wound a thin copper wire onto and managed to get a very small amount of corona discharge, not as much as I'd expect.

May It also be that I'm not connecting my circuit up correctly?

1222939176 1383 FT54770 Newer Gdts

1222939176 1383 FT54770 Disch Term
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Coronafix
Thu Oct 02 2008, 11:22AM
Coronafix Registered Member #160 Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
 		What are your waveforms like on either side of the GDT?
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teslacoolguy
Thu Oct 02 2008, 12:26PM
teslacoolguy Registered Member #1107 Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
 		What kind of cores are you using? If they are iron powder then they will not work well. They have to be ferrite with at least 5000 permability.
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Cotlone
Thu Oct 02 2008, 01:37PM
Cotlone Registered Member #1383 Joined: Mon Mar 10 2008, 11:09AM
Location: Wollongong, NSW
Posts: 27
 		The waveforms are really terrible, the output from the PWM chip seems to be pretty decent though.

My core material is ferrite but is type 77 material which only has a permeability of 2000. I used this because it was reccommended.


This is the primary of one coil

1222954640 1383 FT54770 Prim1



the primary of the 2nd coil

1222954640 1383 FT54770 Prim2


the secondary of the 2nd coil

1222954640 1383 FT54770 Sec2


There could be an issue with some of the driver chips, I had replaced two of them through failure this afternoon. [Mine own fault here I think]
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Mates
Thu Oct 02 2008, 02:16PM
Mates Registered Member #1025 Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
 		I'm too lazy to read all properly, but as I see the wave forms I have few, maybe relevant, questions - what is your core made of? Where did yo get it? Are you sure it is designed for HF use?
You should send also the wave forms of the GDT drive output without load...

BTW: regarding the proper wire for GDT discussion - I'm using the shielded wires from VGA cable from computer monitor. I use the shielding as the primary... It works great and is very easy to get ;)

One more thing: Your topload looks very nice, but I'm affraid that the ring is too fat for producing a proper corona-like discharge...
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Dr. Drone
Thu Oct 02 2008, 08:13PM
Dr. Drone Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
Location:
Posts: 1673
 		shades
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...
Thu Oct 02 2008, 08:47PM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
 		I think that your DC blocking cap in series with the gdt is too small or otherwise bad.

One thing to try is connecting your scope directly across the output of the driver chips, that should look like a very clean square wave.
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