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Re: Smaller than resonance?
Original poster: Slurp812 <slurp812@xxxxxxxxx>
When I first discovered resonant rise, I was playing with a smaller
than resonant cap. and my NST, and a spark gap. I thought for sure
that having the spark gap set too wide wouldn't allow it to fire, and
of course I had to plug it in. Well, it did fire it was LOUD! After
reading more info about it, I am lucky I didn't smoke the NST. The
tendency for resonant rise is present with a cap thats quite a bit
smaller than the resonant value. But its not so with larger values
because there just isn't enough current produced buy the NST. Also
larger cap can give more bang energy. Thats my VERY limited
understanding so far. There is a website that has an experiment with
graphs, etc that clearly shows this, but I forget who's site it is.
The website is probably someones on this list?
On 4/4/07, Tesla list <tesla@xxxxxxxxxx> wrote:
Original poster: Justin <rocketfuel@xxxxxxxxxxxxx>
Hi All,
I'm trying to figure out the right size tank capacitor bank to use with
my new potential transformers.
After much thinking and poking around on the net, I've come to the
conclusion that pole pigs, potential transformers, and any other
transformer (not just NSTs) can hit a resonant condition with the tank
cap. Please correct me if this assumption is wrong. From what I
understand today, it seems that the resonant cap value is a function of
the inductance of the HV secondary and the line frequency. Not sure if
the primary side inductance has an effect. It would be nice if I could
simply measure the inductance of my transformer with a meter and work it
all out on paper, but I have a hunch that a reading on a non-energized
core will be different than when current is flowing through the
transformer.
On to my "real" question. In looking over several other people's coils
online, it seems that many are running much smaller than resonant tank
caps with these larger transformers with no problems. I say smaller
than resonant as a guess based on results I've seen from JavaTC when
entering the parameters listed on these coil sites.
Is it possible to run STR rather than LTR to protect the transformer and
capacitor bank? Of course everything will still need to be matched and
tuned.
Thanks for any input,
Justin in Austin