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Re: GREAT results, but a blow neon... Can anyone help me with a protection network? => SamB

Hi Sam,

	Checkout:

http://www.peakpeak-dot-com/~terryf/tesla/misc/Filter.jpg

The MOVs are strings of 1800 Volt MOVs in series to get to the peak
transformer voltage.

My 9kV/30 coil has a 24nF primary cap but with a sync rotary gap.  You may
get a better spark with a bigger primary cap.

Cheers,

	Terry


At 07:26 AM 04/19/2000 -0700, you wrote:
>  Greetings fellow coilers.
>
> It has been such a long time since I last posted here that most of you
>might have forgotten me... But I have been keeping up more or less with
>the list traffic and, whenever time permits, continued my coiling
>activities (despite now living in an appartment, which severely limits
>things).
> Anyways, I have just recently (3 nights ago) completed another Tesla
>Coil. The goal here was to make a "tabletop" coil that would be small,
>safe, easily portable and yet yield impressive sparks. Modesty aside, I
>think I have quite archieved my goal: With only 225Watts input power
>(7.5kV 30mA NST, with no ressonant voltage rise as the tank cap is only
>0.0068uF), on a coil that has a secondary with 25cm (10") winding
>height and 4.2cm diameter (1.62"), I managed consistent 40cm long white
>hot ground strikes!
> However, even though I had set my spark gap in parallel to the
>transformer and at *just* what the  NST would spark over without the
>tank circuit, it still burned out with less than 30 seconds run time.
>The reason for this is obvious: I was using absolutely no protection...
>So I am here now to call uppon the infinite wisdom of the list and try
>to get some help designing a good protection network that will make the
>neon last. I will of course be incorporating 3 point safety gaps on
>both the capacitor and the transformer, and adding a strike rail to the
>primary. But I would like some help choozing the right
>resistors/capacitors/inductors for the system...  Any suggestions on a
>line filter would be appreciated too (I can actually run this coil at
>full power 2 meters from my computer while its on, but it does cause
>interference to the sound, so I`d like it corrected or attenuated as
>much as possible).
> I will be buying a new transformer this thursday (20th of april)
>afternoon... Please reply to this message as soon as possible
>(preferably to my e-mail too so I don`t get any delays from the list)
>so I can also buy the rest of the protection network on that day. The
>transformer I will be getting this time is a 10kV 30mA NST. More specs
>can be found on my homepage: http://www.powerlabs-dot-org/coil2.htm
> (A note on the homepage though: I have been working on this for a few
>months but didn`t want to publish it untill it was done... If you want
>to browse around go ahead, but beware that this is not nearly complete.
>Any suggestions on it or on any of the things there are more than welcome.).
>
>=====
>Sam Barros,
>sambarros-at-yahoo-dot-com
>ICQ#:15156975
>!!! Check my homepage at http://www.powerlabs-dot-org/ !!!
> "The Less You Know, The Better You Sleep"...
> "Evolution Stops When Stupidity Is No Longer Fatal"
> "If At First You Don't Suceed, Increase The Amperage"
>
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