Re: Phase controller question. Final success

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net> 

Hi Ed,

Isn't this the advantage of controlled firing with SRSG?  It allows a larger
Cp to be charged to the maximum disired voltage.  If the Cp is not
increased, the SRSG could allow charging to a distructive voltage unless the
safety gaps take over or the optimum phase angle is detuned.  Cp should be
2.8 * Cres (allowing for loses).  Anything smaller than this allows for the
possibility of overvoltage does it not?   Cres for 12K 60ma is ~13nf, so Cp
should be ~37nf. With 17 nf, I bet the safeties are fireing a lot (or you
have adjusted the phase angle to less than optimum voltage) and explains why
the performance is same as with static gap.

Gerry R.



 > Original poster: Esondrmn-at-aol-dot-com
 >
 > John,
 >
 > I think you might be right on with that.  I have my 3" coil running with a
 > 12 kv 60 ma transformer, .017 ufd primary cap and a new small sync rotary
 > that I built.  I get close to the same spark length with the rotary as I
 > did the static gap but the coil performs much better with the static
 > gap.  More sparks, longer and thicker.  Maybe I need a larger cap to get
 > the best permormance out of the rotary.
 >
 > Ed Sonderman
 >
 >
 >
 >
 > In a message dated 7/1/04 3:25:22 PM Pacific Daylight Time,
 > tesla-at-pupman-dot-com writes:
 >
 >
 > >Christoph,
 > >
 > >I wonder why the gap is so loud?  It's good it's all working now.
 > >
 > > >Thanks for your
 > > >advice anyway, there is still a lot of tuning ahead for me in the next
 > > >weeks, as I
 > > >believe I should get longer arcs...
 > >
 > >
 > >Maybe you need a larger capacitor value now using the rotary for
 > >best results?
 > >
 > >John
 >
 >
 >
 >