Power Supply NST...

[Nikelopez]

Anyone have any opinions on how suitable this NST is for Star Mode.?

http://cgi.ebay.com/NEON-TRANSFORMER-15 ... 2a0e59922c

[David D Speck MD]

The NST you indicate has a GFI (Ground fault interrupter) circuit. That's good for neon signs, but not so good for non-standard applications like a fusor. You will probably have fewer frustrations with the Non-GFI version.

Same seller has non-GFI transformers, same rating, same money. I'd go for one of those.

Be sure to read the FAQs about NSTs. NSTs may work for a demo fusor, but you will not be able to produce significant fusion with one.

Dave

[Vikram Singh]

for example this one
http://cgi.ebay.com/NEON-TRANSFORMER-TE ... 2a0e59635c

[David D Speck MD]

That may be a better choice that the first unit suggested.

I will have to defer to other list members as to whether you are likely to get a star with this NST.

Check the FAQs to see if you can get a Star with a NST.

Dave

[Richard Hull]

Star mode can be easily obtained with a floating 15kv 60ma neon sign transformer using a high voltage bridge. Note *** this makes the transformer case dangerous,(floating at high voltage), therefore it should be in a wooden box and covered at all times.

The key to star mode is a clean vacuum with an air pressure of about 4-10 microns.

The higher the applied voltage, the cleaner and more distinct the star, but rarely is more than 15kv needed. Good stars can be had at 10-12kv in a well managed vacuum.

Richard Hull

[Vikram Singh]

i thought u said in ur faq tht 40 -50 microns is good for demo? also does this mean tht with a two stage rotary vane pump a diffusion pump is also needed?

[Richard Hull]

Most two stage rotary pumps, if working well, will easily get you down below 20 microns. Demo fusors work well from 100 microns down to extinction near 5 microns.

The most beautiful stars are produced and seen at pressures below 20 microns. You do not normally need a diffusion pump to get a star in a demo fusor. Just make sure you get a good mechanical pump and you should be OK.

Richard Hull