Re: Terry's DRSSTC - Class of Operation?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>

Hi Terry,
          You're heading towards CW operation (some way to go yet
though). That first picture appears to be without a significant
output discharge (maybe air streamers only?) - the rings will
disappear a lot faster when the coil connects with something. I'm not
sure how new this really is. I found it was quite possible to achieve
even closer-to-CW operation (Like virtually no sag between bangs with
bangs just several cycles apart) with a disruptive coil using a
MOSFET gap timed to sub-uS tolerances. That was without any discharge
of course and also at much lower power than you are running. I came
across some scope photos of those expts while wading through a pile
of shots looking for the Marx-related pics I promised I'd dig out.

Malcolm

On 30 Apr 2005, at 23:00, Tesla list wrote:

> Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Hi All,
>
> Now here is a heavy thing!!!
>
> DRSSTCs, being totally electronic, can run at super high BPS rates...
> So fast, that the previous bang never rings down, and "VERY
> significantly" contributes to the next bang:
>
> http://drsstc.com/~terrell/pictures/2940BPS-01.gif
>
> http://drsstc.com/~terrell/pictures/2940BPS-03.gif
>
> http://drsstc.com/~terrell/pictures/2940BPS-04.gif
>
> These are "just" at 2940 BPS...  I can now run at 6000+ BPS...
>
> The limit here is the 125uS the Basic Stamp 2p micro-controller takes
> to process instructions....
>
> I think the "Rabbit" micro-controllers can control the pulse timing in
> the sub 1uS range!!!
>
> http://www.rabbitsemiconductor.com/products/rcm3600/rcm3600.pdf
>
> Thus, one can totally control "each pulse"...  Both T1 and T2 can be
> controlled "on-the-fly":
>
> http://drsstc.com/~terrell/notes/DRSSTC-Timing-Chart-01.gif
>
> BPS may be meaningless now since the controller "can" control
> everything "bang-to-bang".  Adjusting and optimizing for IGBT current,
> IGBT temperature, set point, streamer length,.... in "real time"...
> The coil may no longer have "bangs", but just be "pulse width
> modulated" at your whim...
>
> This, of course, opens up a "can of worms" trying to explain things
> and defining things...  I had to redo my program, but first had to
> come up with this chart:
>
> http://drsstc.com/~terrell/notes/DRSSTC-Timing-Chart-01.gif
>
> I think it defines the variables needed "now" pretty well to do the
> programming....
>
> My BS2p program is here (just open it as a plain text file):
>
> http://drsstc.com/~terrell/notes/DRSSTC-107exp.bsp
>
>
> But the issue is, things are changing!!!
>
>
> We must prepare for a whole new set of definitions and ways of running
> Tesla coils!!!  The days of "fully electronic" Tesla coils being
> controlled by 50MHz micro-processors is almost upon us!!  And those
> darn DRSSTCs are a force to be reckoned with :o))))
>
> http://www.stevehv.4hv.org/mag2-4-30-05/spark6.JPG
>
>
> The World of Tesla coiling is "different" now....
>
>
> Cheers,
>
>  Terry
>
>
>
>
>
>
>
>