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Registered Member #2915
Joined: Fri Jun 11 2010, 10:41AM
Location: Malaysia!
Posts: 101
Hi! Well, the 1st thing is probably: Is your NST a Iron core (10lbs++) or a little, light solid state thing? If it is solid state then it most likely has a GFI and can't be used. If your Xformer is indeed Iron cored, then the 'central tap' is usually 0V which is connected to the case/chassis and therefore grounded to mains ground. Use that as the 'center tap'
If any of this information is inaccurate please correct me !!!
Registered Member #2915
Joined: Fri Jun 11 2010, 10:41AM
Location: Malaysia!
Posts: 101
Oh, I see. I've never seen your type of NST before to tell the truth! Usually they look like this: http://www.blazelabs.com/pics/teslatrnx.jpg With a + 7.5KV, -7.5KV and a central tap (Ground). Unfortunately yours does not have one (Which you've probably realized by now!) Through my (Very) limited knowledge, I either suggest upon a simple safety gap, or to omit the 'Central tap' rail.
Please don't take my word for it though, Wait until a more experienced member comes along! As my HV knowledge is limited. :)
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
juoto wrote ... Yes they are iron cored, here's a picture... They have one high voltage cable and three terminals, two for mains and one for high voltage ground which is also connected to chassis.
Your transformers seem to be the kind whose HV secondary winding is grounded at one end, instead of grounded at the midpoint. So you can use just half of the Terry filter circuit, after choosing the proper number of components in series (proportional to the NST nameplate voltage or half-voltage).
If you use two transformers, as in your picture, you can get double high voltage and a grounded center tap.
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NST filter
