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Forums
4hv.org :: Forums :: Tesla Coils
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DC tesla coils (theory)

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teslacoolguy
Wed Mar 05 2008, 02:09AM
teslacoolguy Registered Member #1107 Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
 		a single gap should work but it will not be as efficent as a multigap.
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Herr Zapp
Wed Mar 05 2008, 05:22AM
Herr Zapp Registered Member #480 Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
 		Mot Man -

Could you provide some additional tech specs on your dual-MOT, 100" output coil?

These data would be useful:
1. Value of charging inductor (if inductance is not known, dimensions, configuration, etc would be helpful);
2. Spark gap (static, fixed speed or variable speed rotary, number of segments or electrodes, disk diameter, etc);
3. Tank cap value;
4. Primary and secondary dimensions;
5. Topload dimensions.

Your help is greatly appreciated.
Shan
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teslacoolguy
Wed Mar 05 2008, 07:24AM
teslacoolguy Registered Member #1107 Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
 		I know you were not asking me this question but i think i have a decent answer. the charging inductor should be around ~14H im not sure about the spark gap but variable speed rotary is my guess. the tank cap shouled bbe around 0.2uf at 20kv +- 0.1uf and i dont have a clue about any other specs on the coil.
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Alexandre
Wed Mar 05 2008, 05:22PM
Alexandre Registered Member #1228 Joined: Tue Jan 15 2008, 01:08AM
Location: Curitiba, Brazil
Posts: 162
 		I am still with a doubt, the charging choke can be replaced by resistors, one for each phase?

What value should i use and power of the resistors?

The 'de-Qing diode' is really necessary?

Judging that I will use two MOT in series with a voltage doubler circuit on the output.
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northern_lightning
Thu Mar 06 2008, 12:13AM
northern_lightning Registered Member #1348 Joined: Sun Feb 24 2008, 01:48AM
Location: Michigan's Upper Peninsula
Posts: 22
These data would be useful:
1. Value of charging inductor (if inductance is not known, dimensions, configuration, etc would be helpful);
3. Tank cap value;
The 'de-Qing diode' is really necessary?

i don't know anything about MOT_man's coil, but i bet this page will help. Link2 thanks Richie smile

i'm now in the design stage myself with a MOT-driven DC tesla coil. what i know for sure: if you're building a small coil (i.e. low power) you'll end up needing a huge inductor!!

with a resistor instead of an inductor, 50% of your supply's power will be burnt up in the resistor.
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Alexandre
Thu Mar 06 2008, 01:14AM
Alexandre Registered Member #1228 Joined: Tue Jan 15 2008, 01:08AM
Location: Curitiba, Brazil
Posts: 162
 		Well, I am intending to use a doubler in my 8 "coil.

two MOT in series with doubler, I believe the choke can be of lesser value?
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Tesladownunder
Thu Mar 06 2008, 02:08AM
Tesladownunder Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
 		One thing I cant get my head around: Does the de-Qing diode have to be a fast recovery type?

TDU
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