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4hv.org :: Forums :: Tesla Coils
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MOT doubler?

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Alexandre
Tue Mar 11 2008, 03:23PM
Alexandre Registered Member #1228 Joined: Tue Jan 15 2008, 01:08AM
Location: Curitiba, Brazil
Posts: 162
Good, I want to use a doubler for my 8 "coil, 24 #, 60cm of winding, gave about 70uH.

But the scheme of the video is a tripler, I would like a doubler!

That scheme of the video is 50 or 60Hz?
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Arcstarter
Tue Mar 11 2008, 05:41PM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Oh i am sorry! Here is the doubler that i used...http://www.raphnet.net/electronique/hv/ hv_en.php
It works well.. It is simple yet effective so it is probably the best way to go. But remember to use a mot or two as a choke after the high voltage out(The high voltage out is the one not connected to the ground on the transformer,right after the capacitor and before the diode)or you will get a direct short of the doubler circuit and it WILL NOT work correctly. I hope this has helped.

P.S. If you ever want higher voltage and more power hook two mot's in anti-parallel or the primary side and series on the high voltage side. Use the same schematic but use two microwave capacitors in series and hook two of those in parallel so the capacitor is 4kv at 1 uf.


And i do not know whether it was 50 or 60 hertz.the schematic is the same either way...for a really powerful coil watch this:http://www.youtube.com/watch? v=mSNy1FW4V24
and watch this: Link2
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Alexandre
Tue Mar 11 2008, 07:17PM
Alexandre Registered Member #1228 Joined: Tue Jan 15 2008, 01:08AM
Location: Curitiba, Brazil
Posts: 162
Is a doubler of a microwave, it is very good, excellent, both which is used in all MO. tongue
But it is half-wave.

The double of Roger, is excellent, but it uses a very large capacitor, I will see if he can adapt to capacitoes, MO. cheesey

And the choke, someone has an idea of values?
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Arcstarter
Tue Mar 11 2008, 08:36PM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Well for a mo doubler i used one mot as a choke. The first video i showed you suggests a mot has around 15h to 20h.i know that you should use two if you use a tripler and one if you use doubler. Use just one for the doubler because it produces more current,whereas a tripler produces less(of course). Also you need two mot's for the tripler because it produces higher voltage therefor requiring two mot's to safely handle the voltages since a mot can handle only 4kv (estimate) without the insulation soon giving up and arcing over. So either get a high voltage Inductor of around 20h or use 1 mot.
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Alexandre
Tue Mar 11 2008, 09:26PM
Alexandre Registered Member #1228 Joined: Tue Jan 15 2008, 01:08AM
Location: Curitiba, Brazil
Posts: 162
OK

I have a roll of wire here, took a secondary an MOT, and the core is empty, I rolled it, following the theory, should give some 20H.

I will use a doubler even easier, and need not both cap. I found several schemes now that given a query, I will decide what I will still use.

But what sets the choke is the source, or has a relationship with the coil?
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Arcstarter
Tue Mar 11 2008, 09:54PM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
I dont get what you are saying. What do you mean by "what sets the choke is the source ot has a relationship with the coil".
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Alexandre
Tue Mar 11 2008, 10:21PM
Alexandre Registered Member #1228 Joined: Tue Jan 15 2008, 01:08AM
Location: Curitiba, Brazil
Posts: 162
sorry, Had not seen that written wrong .....


Wanted to know if the choke is related to the source or the coil?
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Arcstarter
Wed Mar 12 2008, 03:25AM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
It is to prevent the mot and doubler from having a direct short when the spark gap ignites. And without it i couldn't even get a good arc from the doubler.
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Alexandre
Wed Mar 12 2008, 04:14PM
Alexandre Registered Member #1228 Joined: Tue Jan 15 2008, 01:08AM
Location: Curitiba, Brazil
Posts: 162
ok

good
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