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Re: [TCML] Filter Choice
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
**************Ideas to please picky eaters. Watch video on AOL Living.
(http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-duffy/
2050827?NCID=aolcmp00300000002598)
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