Re: Micro Audio Modulated SSTC (completed)

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Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net> 



Hi Jan,

snip
 > Now that IS one cool little coil, congrats!
 > Ideal size for travelling ;-)

Thank you :-)  Yes its small in size sense, but it draws monster power, like
2A so the power supply needs to be large,  it makes my 25v supply bog down
to 20...  I tried 9v batteries in series, but the spark was very small.

The sparks are still pretty sad though, only 1/2" long currently, but then
again im only running 20v.  Maybe I'll make the logic supply separate, and
run the primary off a higher voltage.  Problem is there are monster voltage
spikes on the primary which will kill my transistor...

snip

 > The EXIF info gave ISO 320 and 1/30sec - you could try stopping down ISO
 > to 50 and decreasing shutter down to 1/8 or slower and run the TC in very
 > low light, this should make streamers appear bushier on the pic. And, to
 > get the coil visible too, fire the flash at lowest power. Chances are that
 > your digicamera's automatic "Night Scene" mode does all this, without all
 > those manual adjustments...

I tried what you said, problem is, the spark just became what looked like a
little blue flame, very blurry, like the shape of a water droplet, nothing
like an arc.
My camera is a Sony Cybershot F707,  it has a "nightshot" mode, but that is
an IR illuminated total darkness mode,  is that what you mean by nightseen?

Regards - Jim Mitchell