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Re: power supply options

Original poster: "Scott Bogard" <teslas-intern@xxxxxxxxxxx>

All,
My MOTs are dying, and I don't really know why. I was using a 6 stack, under oil, with the outer 4 cores floated (center tapped ground). I was also using a static spark gap. I now use a synchronous, and I now only use a 4 stack with no oil, and cores not floated, and I haven't burned any out since I made those changes. I also haven't used my coil for more than 10 minutes over the course of 3 weeks (so I haven't really had a chance to try it out). I use a shorted MOT for ballast, and I have a filter circuit, but I don't know if it actually does anything (it is two ohmite resisters, 50 ohms, with the hollow part filled with welding rods, so it acts like an inductor, (I would imagine). I then have capacitors, small ceramic ones, making a link between the three HV wires, some in front of the resistors some behind (I don't remember their exact capacitance, I will check) and safety gaps of course, which don't fire since I got the synchronous). I probably could use the four stack with few problems, but, call me greedy, I want more than 8 kV, 12 is much better. Thanks a heap. 
Scott Bogard.
P.S. Oh, I should mention, all of my stuff, power supply, filter, spark gap, everything, is located under the primary coil, so there may be some problem with inductance or something. Thanks. 



From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: power supply options
Date: Mon, 23 Apr 2007 13:26:43 -0600

Original poster: "Jonathan Peakall" <jpeakall@xxxxxxxxxxxx>

Scott,

Why not attack the problem from a different angle? Why are your MOTs dying?
What can you do to stop it? Maybe you could tell us what you are doing that
kills MOTs and maybe the kind folks on this list can help you find a way to
use them in a manner that does what you want and doesn't wind up frying the
MOTs.

Jonathan
www.madlabs.info

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Some people are like a Slinky .. not really good for anything,
but you still can't help but smile when you shove them down the stairs.
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----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Sunday, April 22, 2007 7:32 PM
Subject: power supply options


Original poster: "Scott Bogard" <teslas-intern@xxxxxxxxxxx>

Greetings all,
     Ok, I am on a students budget, so for now, a
pig is not an option (not even one of Dr.
Resonance's $125 pigs, I am chronically poor,
until I graduate, and get an engineering
job).  Right now I am using MOTs, which are free
(which is very good), and they put out lots of
power (which is also good) but they do indeed
occasionally burn out, and my supply is dwindling
faster than it is growing.  Can anybody give me
another (very cheap) option for a nice and beefy
HV power supply, in case I run out of MOTs before
I graduate in 2 yrs.  I suppose there probably is
no easy answer, but maybe somebody out there can
tell me something to look for (or where to look).
Thank ye kindly.
Scott Bogard.
P.S.  I have considered building a transformer,
but I think it is a little beyond my skill level
(and patience, winding stuff by hand for hours on
end drives me absolutely crazy).  Plus I don't
believe there is any good scrap yards near me, so
I would have to order wire and cores and stuff,
which I think would end up not saving me any
money in the long run.  Thanks again.

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