very high and powerful voltazh voltage from a small voltage

[Hitman]

Hopefully you used a shading material (black cloth or whatever) to close out ambient light when you took the calibration and the solar cell received light from the LED lamp only?  And this shading material was used in the same way when your LED was run from the Sergdo circuit?   Even so, this comparison (may it sound good) includes the lack of the light spectra difference (if any) between the some kHz and the 60Hz mains frequency drive.  IT would be good to know the LED inner circuit, if it includes full wave diode bridge at its mains input and a puffer capacitor then the difference may be less.
However I would like to learn how you adjusted the frequency of the 'thingamabob'  to arrive at the  .41V?

If you look at my 1st pic, you can see the solar cell glued to a round piece of cardboard which was taped to the steel housing of the lamp so there was no ambient light getting in and same was done for both mains pwr and serdgo circuit.

When you adjust the variable resistor the intensity of the bulb varies and this is how I able to adjust the bulb intensity (.41volts on the cell) to equal the mains power. This was not done on the 2 bulbs in series but I could clearly see the intensity of the lights were much higher then on mains.

Theoretically I would agree, the two LEDs in series would consume 2 x 2W but you surely noticed that the circuit consumed less input power when the load was 2 LEDs in series, meaning the LEDs are nonlinear devices and very sensitive voltagewise.  Here again it would be good to know the inner circuit of such LEDs do they include any voltage stabilizing circuits.  Perhaps first a voltage-current curve or tabelle could be made from the mains voltage by a Variac transformator to explore their behavior.
IT may be also useful to connect the two LEDs in parallel, not in series to see the same  .41V or around that from both and then observe the circuit input power.

Thanks,  Gyula

Sorry I don't have a variac to try what you suggest but maybe someone who does could test it out, also I will try connecting them in parallel then I will dismantle 1 of my bulbs and take a look at the circuitry, I just hate breaking apart a 10$ light bulb

Thanks for the suggestions

Cheers Michel

[woopy]

Hi Hitman

go on man good work

i also tried to wind a TV yoke and i get good results at low voltage but much less at higher power. (could get very low melting, nothing in comparison with the torroid ferrite core )
I will try to wind the Joulethief part on one halfe of the yoke and the 2 secondaries on the other half of the yoke to see if there is a difference.

Hi Gyula

thank's  for all very interesting input as usual

I include a pix and ask you your idea on the fact that if use 2 same electrodes on the output of the secondaries, and make some distance between them , in order to install a plasma arc (about 1 cm )    why is the left  end of the plasma arc seemly "cold " and why is the right end seamly "hot"  and melting  the steel.  Is it possipble that the 2 secondaries are dealing with different nature of energy??

thank's

Laurent

[gyulasun]

Hi Laurent,

I assume you use the two HV diodes at the output of the secondaries?

EDIT:  If you use the HV diodes, the "hot" or the "cold" wire end is connected to the common points of the diodes?

Gyula

[woopy]

Hi Gyula


No.. sorry

It is  a direct conection   from the 2 secondaries output leads  to both  electrodes .  (as per  the  Sergdo windings ) with no diode at all.

And if i invert the 2 wires of the secondary leads , i get the  "hot" point end on the left and the "cold " point end on the right

fascinating to me at this point!!

thank's

Laurent

[gyulasun]

Hi Laurent,

Before I forget:  you may wish to WEAR PROTECTIVE GLASSES to watch the arc, maybe an UV protected sunglasses as a minimum precaution to your eyesight,  think about this!

IS it possible that the moment you touch the two wires, a hot spot developes on one of the wire-ends and then as you pull them gently apart, the hot spot stays on its place (but do not ask me now why it would stay,     )

Although this paper deals with DC arc, maybe a good reading on this topic:
http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1963AuJPh..16..228E&defaultprint=YES&filetype=.pdf 

Have you known that in general an electric arc has a negative resistance characteristic in its voltage/current curve? IT means that when current increases in the arc, the voltage reduces between the electrodes or vice versa, within certain voltage values, this is shown in the above paper but here is an interesting circuit from a book, go to this link http://books.google.com/  and enter this title: [ The science of radio: with MATLAB and Electronics Workbench demonstrations ]   and click on the book address (the first one in the appearing list, then in the book roll down to page 80 and 81.  Very interesting, a series LC is shown across the electrodes, it remembers me to replace the L in it with a transformer primary coil...  So the energy coming from your secondaries maintains the arc, the arc has a negative part in its voltage - current curve and it means it could keep an LC circuit in oscillation...  we have to think about this.

EDIT:  Try to use the HV diodes for testing how the hot or cold ends may change and for the book example where a DC arc is involved, not AC arc.


rgds, Gyula

PS: Please when you have some time tomorrow, try answering my questions in my Reply#31 above, I am curious