Re: schematics...Adam Smith's
> Original Poster: "Harvey D Norris" <Tesla4-at-excite-dot-com>
> I am pretty new to all these precautionary measures people indicate as being
> necessary for rf kickback ect. My first question is doesnt the total 6,000
> ohms of resistance in the primary circuit limit your possible performance?
It does consume some power. For a peak charging current (let's
say) of 100mA, you get a drop across 6k of 600V - not really
significant when considering a power source delivering 15kV or
more. Peak power loss is 600W for this example but that is only at
peak current, a somewhat transient transient condition as current
falls off as the cap charges.
> Doesnt the 5.5 mH RF choke contribute a significant portion of the total
> inductance in the primary circuit, thus changing the main needed tank C
> value?. Hasnt RF chokes fallen out of favor and is this a reason why?
No. The chokes are excluded from the tuned circuit by the
conducting spark gap.
> the 2 500 pf caps grounded from the center, are these exclusively a safety
> precaution and/or could they be in the range of value to function as what
> was termed resonant mains or resonant recharging where a small value of
> capacity is used that is resonant to the NST open secondary inductance -at- 60
They shouldn't really participate in resonant charging although they
will to some extent. That should be the preserve of the main primary
Lastly the power factor capacitor, is this now commonly employed by
I always use them with NSTs. Makes switches and fuses a lot