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Registered Member #1367
Joined: Sat Mar 01 2008, 03:18PM
Location:
Posts: 3
I've been looking for a high voltage power supply for quite some time now that I can use to power a Marx generator, Jacob's ladder or a tesla coil. Since i live in Sweden it would be good if the unit could be located in Europe, preferably in Sweden or the United Kingdom.
The only power supply i have found is an NST (, the one rated 10kV - 50mA. Would i be possible to use this?
If not, i would be glad to get some suggestions on where to find a high voltage power supply that fits my needs.
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
for charging a marx generator i would use a dc flyback transformer found in color tv's and depending on what driver you use and the size of the tesla coil you could also use a flyback but for a jacoubs ladder a 12kv 30ma nst would work the best
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
If you can get a 10 kV 50 mA transformer that would be excellent. For all purposes other than a Jacob's Ladder you should use the old/heavy transformer type - not the new electronic types which operate around 20 kHz which adds a layer of complications. You can easily power Marx/J-L/TC with a 10kV 50mA NST.
Registered Member #1367
Joined: Sat Mar 01 2008, 03:18PM
Location:
Posts: 3
I don't know if the one i've looked at is one of those new electronic type of transformers, perhaps someone does?
However i found four NSTs for sale in sweden, perhaps those would be better: Each NST is of different brand but the spec are identical, 4kV, 45mA, weight 4,8kg each. According to the ad thay are about 30 years old but works perfectly fine.
In the picture they are conneted 2 and 2 in serial and then in parallel giving 8kV, 90mA
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
If that picture of the four units is supplied by the seller, I would be cautious about buying them, as you won't know what kind of other abuses the transformers may have been subjected to, besides the ones in the picture.
If I were you, I would bide my time, and be a little patient, so you can get a transformer that would suit a variety of experimental projects.
A good type would be 50Hz 5kV-0-5kV at 30-50mA, a transformer of the older type in a metal case potted in pitch, where the centre tap is brought out to the terminals under the top cover. Such transformers were marketed in England by Tunewell Transformers, and have the advantage that you can use them either in 5kV-0-5kV configurations or disconnect the centre tap and use it as a straight 10kV supply.
Unfortunately, Tunewell Transformers no longer manufacture simple transformers, having changed to the manufacture of electronic high frequency inverters for powering neon signs, which are much less suitable for our purposes.
But I would save your öre until a suitable old-fashioned NST comes up on ebay, when you can get what you want.
Registered Member #1367
Joined: Sat Mar 01 2008, 03:18PM
Location:
Posts: 3
According to the seller they have only been used to power neon signs, not in any highvoltage project.
As you say an old transformer would probably be better but perhaps i can use this four untill there is an otherone for sale (i have already been waiting for a long time).
They are pretty cheap, about £30 including shipping.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
It's true that the old type basic mains transformer NST don't seem to show up on ebay very often these days, and there are always plenty of folk who want to buy them when they do appear.
I'm sure you could have a lot of fun with those four transformers, so if the price is right for you, why not go ahead and buy them?
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