Re: audio modulated SSTC

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

Original poster: "S.Gaeta" <sgtporky-at-prodigy-dot-net> 

Aren't we already modulating our coils with 50, 60Hz, etc, when we power
them with unfiltered DC? Isn't 60Hz, and 120Hz audio?
I am not one of them, but there are a lot of people out there modulating
their coils with power line frequency and not blowing up their MOSFETs!

Sue


\
 >
 > On Thu, 05 Feb 2004 08:17:33 -0700, "Tesla list" wrote:
 >
 >  >
 >  > Original poster: "Mccauley, Daniel H"
 >  > <daniel.h.mccauley-at-lmco-dot-com>
 >  >
 >  >
 >  > If you try to do that, you are going to be running the
 >  > IGBT linearly.
 >  > You will be dissipating mucho amounts of heat there.
 >  > You might be better using something along the lines
 > for
 >  > Class-D
 >  > operation.  You would better off feeding the audio
 > into
 >  > a comparator and
 >  > pulse-width  modulating it and then feeding it into
 >  > your switch on the
 >  > power rail.  However, its not without problems and
 >  > complexities.
 >  >
 >  > Dan
 >  >
 >  >
 >  > Okay the bug has bitten me! (again) and I think I will
 >  > build an audio
 >  > modulated SSTC this weekend.  One question.  If I made
 >  > a self resonant
 >  > design, then I put an IGBT in series with power to the
 >  > bridge, and fed
 >  > audio to the IGBTs gate, woudl that work?
 >  >
 >  > Regards - Jim Mitchell
 >
 >