## Does this look like a good supply?

This forum is for specialized infomation important to the construction and safe operation of the high voltage electrical supplies and related circuitry needed for fusor operation.
beatlemaniacjng
Posts: 20
Joined: Tue Apr 03, 2012 12:04 am
Real name:

### Does this look like a good supply?

So, I found this tutorial on instructables. I think it should work. It gives high enough voltage, and I can tap it at different points, for the different potentials on the electrodes. After each tap I have to modulate it (it being the current) in someway to account for the different polarities of the electrodes, but this seems like it should work.

http://www.instructables.com/id/High-Vo ... ultiplier/

Tyler Christensen
Posts: 551
Joined: Tue Feb 24, 2009 2:08 am
Real name:

### Re: Does this look like a good supply?

It would work (and is how it's usually done) if you were driving it from a high frequency transformer, but at 60hz from a MOT/NST/OBIT/etc. to get fusion currents you would need huge capacitors in the multiplier. This has been done with series strings of Microwave Oven caps by members of this forum, but I can't say I'd suggest it especially if you don't have a lot of high voltage experience, as it is remarkably hazardous.

There is quite a bit of documentation of people's multipliers on this site, search around.

Posts: 2930
Joined: Fri May 02, 2008 11:05 am
Real name:

### Re: Does this look like a good supply?

Not all OBITs are born equal, and some do give out multi-10kHz outputs. See the comment/link I put in; viewtopic.php?f=11&t=4871#p31892 .

Of course, you cannot power something from nothing - if the OBIT is rated at 50VA and you are pushing out 50kV through a stack, then you can only expect 1 mA output (and that's presuming a 100% efficiency too! - call it 0.5mA for 50% efficiency). As more current is drawn, so the volts pull low.

It should also be borne in mind that the power output, even of a 20kHz stack driven from a 50Hz OBIT, will have a 50Hz oscillation to it as the OBIT (however it is internally wired) is unlikely to smooth out a full power draw from it, over a mains cycle.

beatlemaniacjng
Posts: 20
Joined: Tue Apr 03, 2012 12:04 am
Real name:

### Re: Does this look like a good supply?

Plus, even plugging in a regular 120vac outlet at 60hz to the equation he gave, I was pulling 2kv at seven sets. 20kv will be much to expensive and impractical, so back to the drawing board.

beatlemaniacjng
Posts: 20
Joined: Tue Apr 03, 2012 12:04 am
Real name:

### Re: Does this look like a good supply?

So update; What I need to do is take a transformer (OBI for example) and run it through a multiplier.