#4a FAQ - Wiring for real fusion fusor - part one

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Richard Hull
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#4a FAQ - Wiring for real fusion fusor - part one

Post by Richard Hull » Tue Mar 02, 2004 7:10 pm

This diagram is for a demo fusor using a 15kv neon sign transformer. However, the basic circuit shown can, with extra 100 meg resistors in series and modified voltage metering circuitry be tied to a large 40kv or greater grounded, center tapped power transformer. Such high voltage transformer types are found in electrical distribution transformers and potential transformers as well as the ocassional X-ray system transformer.

For a full blown fusing fusor system, X-ray tranformers are best. A 60kv center tapped xray transformer can be expected to give a peak rectified voltage in this circuit of 30 X 1.414 = 42 kilovolts Which is just capable of getting up to 1 million neuts/sec in a well designed and operated fusor at 10ma. Note: With this higher voltage transformer example, the metering circuit would need more series 100 meg resistors and a different metering setup to read to over 40kv. The figuring of this voltage metering circuit is left to the individual.

Needless to say, such transfomrers are lethal and demand a massive 50amp 240 volt breaker box connection. They are unforgiving. One wrong step and you are dead. Of course, real fusion high voltage must be at least 25 kilovolts DC and this, in and of itself, is instantly lethal.

The 100 megohm resistor is best made up of 10, 10 megohm 1 watt 2% or better flame proof resitors, in series, floating in air between two posts on clean plexiglass. True 100 meg resistors, (hard to locate), can be used in series for larger voltages than 10kv. I prefer 0ne 100meg resistor in the voltmeter circuit for every 10kv of desired output.

You will note this same circuit "layout" can function for both a neon demo supply and a full blown fusing fusor system. The difference is that this circuit has handmade diode strings and a large 100 watt ballast resistor.


[b]Update 2018: Digital panel meters of the 200mv type are rare now. A free Harbor freight digital volt meter set on the 200mv range will do fine for the meters shown here. On the voltmeter, if you go over 20kv out of the supply, change the range to 2000mv (2volts) to read zero to 200kv. If you can't get free coupns for the voltmeter at harbor freight, they are $5.95 list price.[/b]

Richard Hull
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Values shown are for 15kv neon transformer
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Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

Cristiano_Machado
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Re: #4a FAQ - Wiring for real fusion fusor - part one

Post by Cristiano_Machado » Sat Nov 17, 2018 6:33 pm

Dear Richard,

I know it's not appropriate to post doubts in faqs, please fell free to erase it, after answer.

I saw in your other post about "Measuring Fusor Voltage" viewtopic.php?f=29&t=4267 that you recommended using 100megaohms resistors for each 10 kV to be measured. In this post you recommended just one group of 100megaohms resistors and changed the panel meter.

I would like to know each setup is better (if any).

Thanks,

Cristiano

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Richard Hull
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Re: #4a FAQ - Wiring for real fusion fusor - part one

Post by Richard Hull » Sat Nov 17, 2018 10:02 pm

You will notice the absolute limit in this schematic is only 20kv on the voltmeter. This assumed a 15kv neon sign transformer. This circuit is much more suited to a demo fusor. 10kv max output.

I have altered the FAQ accordingly.

However I use this exact circuit for my 40kv x-ray transformer but with 4 100meg resistors in series and and altered voltage metering system.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

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