Re: [TCML] Filter Choice

[Mddeming@xxxxxxx]

Yes,
 
They are very different and for very different purposes. EMI filters are  low 
voltage side of the NST devices for keeping RF hash generated by your coil  
out of your house lines and out of your (and possibly you neighbors' )  other 
electronic devices. A Terry filter is a high voltage side of the NST  device 
designed to keep killer high voltage spikes out of your transformer.  Terry 
filters were developed right here by our former moderator, Terry Fritz,  hence the 
name. . It may seem pricey, but after the first couple  of toasted NST's  it 
will seem cheap.  IF you can properly set a  safety gap and NEVER be tempted 
to fiddle it a bit wider, and never have a  ground lead come loose, then you 
can probably get by without a Terry  filter. There are, of course, those who 
don't believe in Terry filters, (or  seatbelts, or bike helmets, or condoms, or 
not smoking, or safety glasses, or  some combination of these) It's up to you. 
How lucky to you feel?
 
Matt D.
 
 
 
In a message dated 2/23/08 9:23:05 P.M. Eastern Standard Time,  
doxiescott@xxxxxxxxx writes:

Hello  again guys.  The troubleshooting tips I got here on my first post  led
me to replace my NST and as a result my coil is now resonating, thanks  to
all.

Now that I'm onto tuning, I would like to protect the power  supply systems
before I do any runs longer than a few seconds.  The  construction of a
safety gap, variable power output, ext. are within my  technical grasp, but I
would like some advice on a choice of  filter.

>From what I have read, I need a RC low pass filter  installed after the HV
outputs of the NST.  A Terry Filter seemed like  the only choice, but I have
been coming across  these:
http://cgi.ebay.com/RFI-EMI-Tesla-Filter-2-x-20-Amps-115-250vac_W0QQitemZ14020
8669619QQihZ004QQcategoryZ7288QQssPageNameZWDVWQQrdZ1QQcmdZViewItem#ebayphotoh
osting
on  ebay and local industrial shops.  Is this something different than  a
Terry Filter?  Would I want both?  Is there a cheaper filter  solution from a
Terry Filter or place to buy them commercially  They  seem rather expensive
to build from scratch.  Thanks for the answers,  my coil specs are:

60hz 9kv NST @ 30ma, secondary balanced midpoint  ground
0.0085 uF caps @ 17600 volts







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