Three 15KV 250mA NST's? Wow! I've never heard of an NST more than 120mA.
If you're correct about the current rating of those beasts, you'll need
quite a large capacitor array to fully unitize so much power, and building
an MMC might be pushing the limit on when it makes sense to buy a
professional pulse cap rather than the MMC approach.
> I especially am interested in inductor usage to prevent spikes back to
the NST.
There was a time when it was thought that RF chokes between the active TC
components and the NST was useful in protecting the NST from ill-defined
threats. More recent analysis suggests that chokes may cause more harm
than good. My analysis is detailed here:
http://www.laushaus.com/tesla/protection.htm
Current thinking is that an R-C filter is the best protection, couples with
MOV surge suppressors and correctly-set safety gaps, collectively known as
a Terry filter.
Regards, Gary Lau
MA, USA
On Sat, Aug 22, 2015 at 5:10 PM, Matthew Sweeney <msweeney23@xxxxxxxxx>
wrote:
> Hello, I recently joined this mailing because I didn't know it existed. I
> don't make tesla coils any more but I produce large Van De Graff generators
> and simple kelvin thunderstorm projects to amuse myself and keep my nephews
> amazed.
>
> Anyway I visited my local Axe-MAn today and learned that they have a
> customer named Mike Delosier who lives in minnesota and has some
> impressive coils.
>
> I am hoping very much to contact Mike but I have not been able to find his
> e-mail address. I don't see any recent posts with his name so maybe he is
> not a member anymore?
>
> So, if anyone knows him, I would be delighted to send him an email.
> Alternatively he can send ME an e-mail as to be less intrusive:
> msweeney23@xxxxxxxxx
>
> I did build several decent coils over 20 years ago with home made plate
> class capacitors and a horribly inefficient stationary spark gap. I didn't
> have any protection circuitry in place but somehow my HV transformers
> survived, however my capacitor eventually exploded.
>
> Now I have three perfect 15,000v 250ma NST's just sitting waiting for a
> purpose - so I think it's time to start planning a new build. I have never
> built a proper solid state coil and am considering this option. But a
> traditional rotary spark-cap coil with high-voltage capacitors would be
> much less effort. The secondary will be 5 Feet and using enameled magnet
> wire.
>
> I'm looking for good sources of (cheap) high voltage capacitors and much
> info on recent developments in the field. I especially am interested in
> inductor usage to prevent spikes back to the NST. Also I need some advice
> on secondary wiring cable is there a preferred variety for recent coils?
> Ill use copper tubing for primary. I may also build my own rolled
> capacitors but I'm thinking obtaining newer HV caps in a bank may actually
> be cheaper.
>
> If there other members in the Minnesota/Wisconsin I would also like to
> connect. I'm desperate to find a powerful coil to blow my nephews minds =)
>
> Thank you for any help you can provide. I'll be reviewing the lists looking
> for new info also but direct contact for any suggestions would be welcomed.
>
> Regards,
>
> Matt Sweeney
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
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