I was playing with another tuning capacitor on my system of Tesla bifilar coils and look what happened:
When it happened I was holding the capacitor and tuning it by hand, and the LED flared up so brightly and suddenly that I nearly crapped my drawers. It was only for a second, then it dimmed. I spent at least half an hour trying to duplicate the event, before I got it under control. I thought, OMG, I really found it, and now I'll never get it back, and I'll spend the rest of my life chasing it, like all those others, and nobody will believe me, and...
And then I found the resonance again.
I knew, obviously, that tuning the coil would have an effect, but this really surprised me.
Oddly, it seems to glow even brighter if the connection to the variable cap is loose.
I need to get a better air variable out of stock, and play with this some more, maybe improve the range and stability.

----
http://www.youtube.com/watch?v=sqMWHhkdQMk

@Wattsup

SNIP
>>So, I know you are saying the transistor diode can handle it. For me this is EE talk. The OU talker is saying, hey, I don't want you to >>handle it, I want you to send it back to the source, period, no ifs ands or buts. This is where if both the EE and OU minds can come >>together, I know we will have some great results.

Thank you for posting you thoughts and concerns about the coil(s) back emf generated voltage. I will address this topic for you.
First take a look at the attached drawing. I have snipped out the switch part and also shown the internal diodes that is inside
the transistors. I have added a plus and minus sign at the input of the switch where the battery will be. When I say "handle" the
bemf voltage then this is my bad English for saying I have given it a lot of thoughts on how to take the bemf voltage and put it
back to the input battery instead of wasting it as heat. Also pay attention to the high voltage electrolytic capacitor.

Now let us see what happens when we start pulsing the coil. First we connect the coil to plus and minus one way by closing
two of the transistors. The coil will charge up. It is like compressing a spring. Then we open the two transistors and the coil
will decompress and release its energy. But since the transistors are off now the coil is not loaded and can decompress much
more. This will give a higher voltage than we initially provided to the coil. Where does this voltage go? It has only one path to go
and that is via one top diode and one bottom diode. This will charge up the capacitor (and the connected battery). Now we time
the next transistor switch on (this is the resonant part) in such a way that we only fill up with energy when the coil has bunched
back to a reversed polarity state and has reached its top potential. This way we do not need to fully charge the coil since we just
refill the lost energy. When the transistors open again, then the coil will stretch the other way giving out the high bemf voltage
via the two other diodes and back to the capacitor. Then we repeat the process. The timing of the switch on and switch off
is controlled by the micro controller IC so that there is a small pause between the switching that allow the coil to be totally
disconnected from the capacitor (and battery). This will allow the coil to reach its maximum peak voltage between each pulse.

I hope I have explained this good enough.

@najman100,

WoW, great looking PCB. You have done a very good job. :-)

@TinselKoala,

Great video. :-)

Groundloop.

groundloop, thanks for the very clear explanation. It probably accounts for what I'm seeing on my rig:
You may note that in my last video above, I don't have the DMM in the circuit. But just now I put it in, monitoring the voltage on the _input_ capacitor as usual. (BTW I put an additional 100 mfd electrolytic and a 0.5 mfd ceramic cap  across the bridge input as groundloop suggested). This reading is usually quite stable and agrees with a DC measurement of the battery voltage unloaded, when the output is also unloaded.
So it indicates +22.6 volts at the present state of charge of my LiPos.
Now, when I have that little air/mica variable tuned just right and the LED flares up brilliantly, the voltage indicated on that meter goes to a very stable -59.6 volts. That's minus fifty-nine point six volts. And when I go off the exact resonance freq, either by detuning the signal generator or the variable cap, the meter returns to the normal +22.6 volts.
I'm really surprised that it does this, considering all the capacitance I've got in parallel there. I don't know if the DMM is just confused, as predicted earlier by groundloop and Stefan (and me, and probably everybody else too), and I don't know if the analog meter will also behave this way. That's for this evening's experiment, I guess.

(Oh and btw I discovered that I can add a _third_ flat coil to the stack, and light the series bank of three LEDs with a single wire from that coil and my finger, like in the above video...but if I hook _both_ ends of that coil to the LEDs it will not light at all...)

@all
Merry Christmas .

Najman100

This MAN, LUC Is a hero of this community

He worked for MONTHS with Thane [I think at least four] Winding coils till his fingers blead
FOR NOTHING[at least in dollars]

ALSO UNTIL HIS BACK GAVE OUT BUT HE DIDN'T GIVE IN EVEN THEN...
I BASICALLY HAD TO "CARRY" HIM TO THE CAR AT THE END OF EACH DAY.

THE RESPONSES HERE, THE HUMAN CO-LABOR-ATION OF ALL CONCERNED AND THE PACE IS TRUELY "INSPIRED"!

TO ANYONE WHO WANTS TO KNOW WHO INSPIRES LUC AND TO WHOM IT'S DEDICATED...

"Love is the currency of the Divine"
http://www.eaisai.com/baba/

Sathya Sai Baba - Team Player
http://www.youtube.com/watch?v=jlH915HI-Y8&feature=related

ALSO UNTIL HIS BACK GAVE OUT BUT HE DIDN'T GIVE IN EVEN THEN...
I BASICALLY HAD TO "CARRY" HIM TO THE CAR AT THE END OF EACH DAY.

THE RESPONSES HERE, THE HUMAN CO-LABOR-ATION OF ALL CONCERNED AND THE PACE IS TRUELY "INSPIRED"!

TO ANYONE WHO WANTS TO KNOW WHO INSPIRES LUC AND TO WHOM IT'S DEDICATED...

"Love is the currency of the Divine"
http://www.eaisai.com/baba/

Sathya Sai Baba - Team Player
http://www.youtube.com/watch?v=jlH915HI-Y8&feature=related

"If there is righteousness in the heart,
There will be beauty in the character.
If there is beauty in the character,
There will be harmony in the home.
When there is harmony in the home,
There will be order in the nation.
When there is order in the nation,
There will be peace in the world." 
-Baba- 

Thank you Thane for the praises and for sharing some of my Guru's (Teacher's) teachings.

I had not seen this video until now.

Thank you for sharing.

Luc

Hey Luc,
One of the most fustrating problems for me with breadboard'n circuits was those dern breadboard sockets get bad connections or even no connection at all with in the breadboard.It took me 4 ever to find a section with all good remainning connections at one time.I hope maybe that's all wrong with yours but that is the most fustrating thing for me sometimes..... keep'n a good breadboard.