Self running coil?

[gravityblock]

I don't like the idea of open air core coil designs because
powerful oscillating magnetic fields go all over.

:S:MarkSCoffman

I can't speak for Luc, but I don't think his intent is to use the air coil.  What he was trying to demonstrate, is why does the circuit with an air coil and a lower resistance, perform worst than the same circuit with a toroid with a higher resistance, and they both are resonating at the same frequency and have the same inductance.  According to the text books, a circuit with a lower resistance should be more efficient than a circuit with a higher resistance when at resonance.....but it's not in Luc's experiment.

GB

[skywatcher]

@Luc:

I just watched your video #13. Did i understand it correctly that the circuit runs without the function generator connected (only for starting it) and without any other outside connections ?

[mscoffman]

I can't speak for Luc, but I don't think his intent is to use the air coil.  What he was trying to demonstrate, is why does the circuit with an air coil and a lower resistance, perform worst than the same circuit with a toroid with a higher resistance, and they both are resonating at the same frequency and have the same inductance.  According to the text books, a circuit with a lower resistance should be more efficient than a circuit with a higher resistance when at resonance.....but it's not in Luc's experiment.

GB

He didn't state what the pictured circuit was, I see something resonating
nicely along at eight volts to the gate and and something else not resonating
very well as the load. The load Q~=1.0 and the phase shift is nearly 180
degrees out-of-phase with the input - that's hard to do. It reminds me of
that air core coil.

:S:Mark

[Cap-Z-ro]

I believe it may be time for another one of my tried and true famous quotes.

" I made a lot more electricity with steel than I ever made with copper "

- Ed Leedskalnin


Regards...

[mscoffman]

@Luc:

I just watched your video #13. Did i understand it correctly that the circuit runs without the function generator connected (only for starting it) and without any other outside connections ?

@skywatcher

This is correct; about @49ua  - 100uW is coming out from the caps.
I estimate about 200mW about 1/5W could be made available from
the pickup coil. - Because he hasn't done the max(P)=E^2/R. Which
would match the output impedance of the coil to the (1K) load resistor.
So this is *way* overunity.... If he would build the HF AC transformer/
voltage multiplier he could run the cap by charging it, running the current
backwards. Then solving that problem, we could prove OU on you-tube. 

:S:MarkSCoffman