Re: xmfr and cap question ?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Mike <megavolts61@xxxxxxxxx>

Mark,
   To size the cap,  use the mains frequency, then multiply it by 
1.3 - 1.5 to keep the voltage stress off the secondary windings of 
your NST(along with a Terry filter).   I"m not sure where you got the 
20Hz in your second calculation.  The 4.2nF cap would be resonant for 
your NST, so I'd suggest about a 5.5nF cap for your tank circuit.

Hi all,

A quick thanks to everyone who's responded to my questions of late,
much
appreciated.

I have another though .. I've noticed there is a thread regards
calculating the Cap size need.  When I original sized the cap I used
the
mains line freq of 50Hz however I've noticed that others have used the
secondary sides freq ?? and I'm a tad unclear as to which side to use?
I've made the following calculations

(Primary Side) 15Kv @ 20ma @ 50Hz = 0.0042uF

or

(Secondary Side) 15Kv @ 20ma @ 20Hz = 0.0106uF

I did the original calculations using TeslaCAD and Deepfriedneon both
of
which indicated I use the mains freq, could someone put my mind at rest
on which freq I should be using ??

Cheers and many thanks

Mark


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