Tesla Coil Transformers....

To: tesla-at-pupman-dot-com
Subject: Tesla Coil Transformers....
From: "Sam Barros" <sambarros-at-hotmail-dot-com> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
Date: Sat, 05 Sep 1998 14:04:02 -0600
Approved: terryf-at-verinet-dot-com
  Greg,

 First of all, thanks for replying...
 There are still many things I need to know, such as the primary design 
and the chokes. Still, thanks for shining some light on the transformer 
problem.
 Perhaps I could pay some more for a NST. How much would an used one 
cost? Is shipping really THAT expensive? I would expect sending it by 
boat to cost less than 20bucks... How heavy are those anyway? (12KV, 
100mA ideally, but 10KV 100mA and 15KV 60mA would also be good. I 
wouldn't mind more power, though... Up to 3KW is OK...)
 I heard a lot about Microwave transformers. All bad... I heard they are 
heavy, inefficient, burn out in TC service and are not really power 
limited. I have a 2300V, 0.5A unit. It is excellent for a Jacob’s ladder 
and for frying, burning an melting stuff. But I think it would make a 
lousy TC transformer. The power output is far too high and the voltage 
is less than half of what I need. Putting 4 of them in series would 
probably destroy their insulation, not to mention blowing my 16A max 
fuse.
 Could you give me some more info on those 5KV, 0.3A transformers? Are 
they really worth their price?
 Can I run a 60Hz transformer on 50HZ without any problems?

 Thanks!



>Sam,
>
>You're in a tough spot.  You're going to have a tough time getting a =
>1000W NST for $50.  The international shipping alone is probably more =
>than that.  I do have a couple of suggestions though.
>
>You could try using microwave oven transformers (MOTs).  You can get =
>these cheap or even free from dead ovens.  MOTs are practically =
>indestructable--ovens die due to failed electronics or failed magnetron 
=
>tube.  If you advertise that you will buy dead ovens for $5, you will =
>probably be offered several.  MOTs range in power from 500 to 
1500Watts. =
> The smallest ones develop about 1800VAC, the largest about 2500VAC.  =
>Medium sized ones run 2000 - 2200VAC.  Four of these with secondaries =
>wired in series would make a formidable 7 - 9KV power supply.
>
>Another possibility is Herbach & Rademan in the USA.  They sell used =
>photocopier transformers rated 5KVAC -at- 300ma.  They have 115v 
primaries, =
>but could be wired in series for 240v service, yielding a potent 10KV =
>power supply.  These are $40 each, plus shipping.  I can send you more 
=
>info on these transformers & how to order them if you wish.
>
>Best of Luck
>
>Greg

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