Re: SS NST--Good for anything?

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Original poster: "jimmy hynes by way of Terry Fritz <twftesla-at-qwest-dot-net>" <chunkyboy86-at-yahoo-dot-com>


i guess it could have been a rounded triangle wave instead of a pure sine wave
but i fried all my 1 meg resistors in that test so i couldnt check. i couldnt
measure the resistance of my secondary, so i guess there is a capacitor in
there. why would that explain the rounded triangle wave though? i did a pspice
simulation of a transformer with a capacitor and resistor in series with the
secondary and got a weird sawtooth/square wave. the voltage raised instantly to
the max and then drained down a little bit then instantly went to the maximum
negative potential and did the same thing. what would i do with the capacitor
to get a rounded triangle wave? 

  Tesla list <tesla-at-pupman-dot-com>
>
>  wrote:  
> Original poster: "Justin Hays by way of Terry Fritz " 
>
> Hi All,
>
> > i bought a 15kv 20ma at 20khz solid state neon transformer off 
> > ebay. i made a voltage divider with a couple of 1 meg resistors and
>
> > looked at it with an oscilliscope. i was suprised to see that the 
> > voltage was sinusoidal. why is it sinusoidal? i was guessing it 
> > would be square wave or maybe a pretty low voltage with high 
> > voltage spikes, like in a flyback transformer. if it uses resonance
>
> > for at least some voltage gain it would be a sine wave but i dont 
> > see how else it could put out sine waves(except for wasting a bunch
>
> > of energy in the switches).
>
> Although I'm sure the circuits vary from manufacturer to 
> manufacturer, the ones I've seen are half-bridges that hard switch 
> the ! primary of a HV stepup transformer. Of course, like any switcher, 
> the output (of the bridge!) is a square wave to minimize 1^2 
> (heating) losses in the transistors. 
>
> Remember, just because the output looks like a sine wave doesn't mean 
> that it's input is a sine wave.
>
> On a different note, what you're looking at may or may not be a true, 
> formed with resonance, sine wave. The shape can be hard to 
> distinguish sometimes...I notice that the output of my SS neon 
> transformer is something like a rounded-off triangle wave. Along 
> those lines, I can't measure DC resistance across the output of my SS 
> neon....which probably means there is a series HV capacitor in there 
> somewhere.......which explains the rounded-off looking triangle wave.
>
>
>
> Neat little circuits....I could power a TC with mine as the output 
> can be shorted with no problem.
>
> Take care,
>
> Justin Hays 
> KC5PNP 
> Email: justin-at-hvguy-dot-com 
> Website: www.hvguy-dot-com 
> _
>
>
>
>
>
> JImmy
>