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Re: FILT1.JPG (Was Terry's NST Filter Network)

Hi Daniele,

	That is an old obsolete design but it will work.  I have since found that
it was overkill.

I now recommend the filter at:


Some people have another set of safety gaps instead of the MOVs.  I like
MOVs at the NST because you don't have to set them and nothing can go
wrong.  However, they will not discharge the primary caps (more than once
;-)) so I still use safety gaps at the primary side.



>At 07:43 AM 6/4/00 +0200, you wrote: 
>Hi Terry, all,
>I would like to ask if the protection circuit schematic in the file 
>filt1.jpg (on you site)
>is only an experiment or is still valid... I can see 2 safety gaps instead 
>of one and 
>4 resistors of 5K 50W instead of two. I have been following all the thread 
>"Terry's NST Filter Network"
>And since I have to do one for me, (for a 12/60), I have looked also at the 
>Gary Lau design (on his site).
>I have also read your papers about filtering. Normally I see that the 
>protection circuit looks like half of this one.
>Can you please explain to me why ? Is this "double filter" necessary to be 
>"all safe" ?
>Or is it something like too much protection, so now you circuits are reduced 
>to half that design ?
>Someone also have suggestions, or particular designs to suggest for my 
>safety gaps ? :)
>Tnx all in advance