Re: Improvement to audio modulated SSTCs?

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

Original poster: "Eastern Voltage Research Corporation" <dhmccauley-at-easternvoltageresearch-dot-com> 

The hiss is a property of the plasma and its operating frequency.  Hiss is
present up to about 3MHz and then it almost disappears.
Dan


 > Hello all,
 >
 > I have never witnessed any kind of SSTC in operation (there just aren't
 > that many coilers in Australia, and most of them are 000s of kms away),
but
 > I have been looking at some schematics for audio modulated SSTCs. Many
 > pages out there claim that the output has a distinct hiss or buzz, in
 > addition to the music.
 >
 > Is it possible that this may be due to ripple in the HV supply? In regular
 > audio amps (a tangent I took for the last year or two, while taking a
break
 > from TCs) a supply ripple of only a few mV can cause substantial hum at
the
 > speaker, particularly when dealing with the single-ended class a amps I
was
 > fiddling with. I have never heard a SSTC, so I can't say if the hiss is
the
 > result of a 50/60/100/120 Hz ripple, or purely the nature of a spark
 > discharge, but one would assume that because the TC "amplifies" the input
 > voltage, any ripple in the input voltage would cause ripple in the output.
 >
 > Anyway, back on topic, has anyone tried properly regulating the HV supply
 > on the AMSSTC? This can be done easily with a N channel mosfet follower
 > "biased" by zener diodes, with significant current ability:
 >
 > http://www.passdiy-dot-com/images/projects/zv3-f2.jpg
 >
 > paralleling devices in this configuration is easy for more current if you
want.
 >
 > See the full article at http://www.passdiy-dot-com
 >
 > Just thought this might interest you all. I might be barking up the wrong
 > tree, but a properly regulated supply is the only way for true 100% cw
 > operation right?
 >
 > Sorry for all these "thinking out loud" posts lately, but it is clear that
 > with the new developments of DRSSTCs, OLTCs, etc,  SSTCs are going to
 > become real contenders in the coiling arena, so info like this won't go
 > astray. Also the availability of "production" SSTC boards (thanks Dan) has
 > encouraged more people to construct these than ever.
 >
 > BTW, this "thinking out load" is going to pay off.......Just wait till you
 > guys see the SS based coil I am already constructing :) It's going to
 > really be pushing the envelope in SSTC design..........No new ideas
really,
 > just the old ones taken to the extreme.
 >
 > Cheers,
 >
 >
 > Greg Peters
 > Department of Earth Sciences,
 > University of Queensland, Australia
 > Phone: 0402 841 677
 > http://www.geocities-dot-com/gregjpeters
 >
 >
 >
 >
 >