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Re: Low-power experiments with a DRSSTC

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>


If Antonio were to place a simple 1/4W 220K resistor in series with say a 5pF cap from the output to ground that would fix it. Then the system's voltage would rise until the loss into the resistor equals the power input and the plateau would be seen. But I think Antonio is going for a more theoretical energy transfer analysis at this point.

Capacitive streamer loading could be reproduced by simply adjusting his antenna to a few more pF. I really like the antenna idea!! I sometimes want to adjust the tuning very accurately. However, every time I try to adjust the primary tap point too much changes. The whip antenna should do that very precise tuning very well!!

If you simply add the streamer capacitance to the terminal capacitance, the frequency shifts work out well.

I have been thinking of making an analog Tesla coiling computer. A very low power thing that would do stuff like Antonio is doing. I could probably find a real analog computer on Ebay for $5 these days ;-))



At 11:00 AM 8/31/2006, you wrote:

I find that producing (long) streamers has a dramatic impact on all of
my systems.  The primary current envelope never looks the same as it
does with sparks being produced.  The Q of the system seems to drop
off steeply, and this is reflected in the primary as a plateau of
primary current, and sometimes a near-notching condition (where as
before spark production, the primary current would continue to rise).
Ground sparks seem to present a different load all together, and may
result in the primary current climbing higher, or dropping off, it
depends a lot on the tuning.  Note that my systems use primary current
feedback, so driving the system from a fixed oscillator is probably a
different story.

Steve Ward

On 8/31/06, Tesla list <tesla@xxxxxxxxxx> wrote:
Original poster: acmq@xxxxxxxxxxxxxxxx


I have made some experiments to verify if my ideas about how to design a
DRSSTC work as expected. A programmable signal generator makes an adequate
driver for low-power excitation:
The design procedure is described here:
It's interesting to observe that the same elements used for a regular Tesla
coil work almost exactly for a DRSSTC. Only a small tuning adjustment is
required, and losses and detuning affect both systems in similar ways.
It remains to be verified how this works in producing sparks. If
the Tesla coil works, and the waveforms are almost identical, the same
results are expected.
Note that I used sinusoidal input. Square wave input doesn't change
much the waveforms.

Antonio Carlos M. de Queiroz