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4hv.org :: Forums :: Tesla Coils
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Very dissapointed in MOT Tesla coil.

 1 2 3 
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dexter
Fri Apr 03 2015, 04:46PM
dexter Registered Member #42796 Joined: Mon Jan 13 2014, 06:34PM
Location:
Posts: 195
what is wrong with MKP capacitors in a SGTC?
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Patric
Fri Apr 03 2015, 06:35PM
Patric Registered Member #2899 Joined: Wed Jun 02 2010, 06:31PM
Location: Deinze, Belgium
Posts: 254
and there he is... Jakob!

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Teodor Zafiroski
Fri Apr 03 2015, 10:28PM
Teodor Zafiroski Registered Member #48007 Joined: Wed Jun 18 2014, 01:00PM
Location: Prilep, Republic of Macedonia
Posts: 33
dexter wrote ...

what is wrong with MKP capacitors in a SGTC?
Everything except the dielectric, they are metallized, so only suitable for low currents, a Tesla coil demands high pulse current foil or film/foil caps. FKP-1 from WIMA are an excellent choice... i was able to make a Tesla coil using MKS caps, 10 in parralel, and they had very large losses, also tried with MKP, they also heated a lot but had much lower dissipation. When I replaced the bank with onlu 2 FKP-1 from WIMA in parralel, the operation of the tc was much improved and the caps didn't heat at all...
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Download
Sat Apr 04 2015, 12:11AM
Download Registered Member #561 Joined: Sat Mar 03 2007, 02:46AM
Location: Adelaide Australia
Posts: 230
Patric wrote ...

In parallel the MOTS take to many amperes.
I gave up, and will use the MOTS for a beautiful Jakob's-ladder. sad

Movie is coming in a couple days.


You want the MOT primaries in parallel and two sets of two mots with their core's connect together (in series) before connecting in parallel.

Can someone draw him a diagram?

[Moderator edit: double post merged by Mads Barnkob]
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Patric
Sat Apr 04 2015, 05:39PM
Patric Registered Member #2899 Joined: Wed Jun 02 2010, 06:31PM
Location: Deinze, Belgium
Posts: 254
Teodor Zafiroski wrote ...

Maybe two MOT's instead of 4, and use one with a shorted secondary to ballast them both. So you will need three MOT's and the power demand would be reasonable...
At that power levels, a static spark gap is not suitable.
Also, why did you use MKP caps in a SGTC???
Other caps are very expensive, and I thought those caps were alright...
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Dragon64
Sat Apr 04 2015, 08:37PM
Dragon64 Registered Member #1438 Joined: Sat Apr 12 2008, 12:57AM
Location: Canada
Posts: 218
Download wrote ...

Patric wrote ...

In parallel the MOTS take to many amperes.
I gave up, and will use the MOTS for a beautiful Jakob's-ladder. sad

Movie is coming in a couple days.


You want the MOT primaries in parallel and two sets of two mots with their core's connect together (in series) before connecting in parallel.

Can someone draw him a diagram?

[Moderator edit: double post merged by Mads Barnkob]

You mean this?

NObvwGG
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Mads Barnkob
Sat Apr 04 2015, 08:37PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
There is nothing wrong with using MKP capacitors for a Tesla coil of any kind, it is one of the best available pulse capacitor types we have.

Any improper design will suck even if you use good capacitors, use the tools and theory found online to check your designs.
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Download
Sun Apr 05 2015, 10:43AM
Download Registered Member #561 Joined: Sat Mar 03 2007, 02:46AM
Location: Adelaide Australia
Posts: 230
Dragon64 wrote ...

Download wrote ...

Patric wrote ...

In parallel the MOTS take to many amperes.
I gave up, and will use the MOTS for a beautiful Jakob's-ladder. sad

Movie is coming in a couple days.


You want the MOT primaries in parallel and two sets of two mots with their core's connect together (in series) before connecting in parallel.

Can someone draw him a diagram?

[Moderator edit: double post merged by Mads Barnkob]

You mean this?

NObvwGG

Yea, that.

Primaries all in parallel, two secondaries connected by their cores in series, then connected in parallel with the other two secondaries.
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Patric
Sun Apr 05 2015, 11:56AM
Patric Registered Member #2899 Joined: Wed Jun 02 2010, 06:31PM
Location: Deinze, Belgium
Posts: 254
And what ballast? And then you have only 5000V without the ballast.
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Patric
Sun Apr 05 2015, 02:23PM
Patric Registered Member #2899 Joined: Wed Jun 02 2010, 06:31PM
Location: Deinze, Belgium
Posts: 254
I will begin all over again, and I want sparks from min. 0.5m (2 feet).
I will use this secondary:

1428243630 2899 FT170179 Bigboltesla


Ball diam: 25 cm (10 inch)
Height: 52 cm (21 inch)
Diam: 11 cm (4.4 inch)
Wdg: 650
Diam Cu: 0.8 mm (awg 20)
Res freq: 352 kHz

I have time, in the meantime I enjoy my Jakobsladder. cheesey

Help...
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