Dr Ronald Stiffler SEC technology

[NickZ]

  Slider:   It is as I had suspected, that once the oscillator is working properly, there is no need for the clip lead, aluminum blocks, or touching the device, etz... And adding ferrite at that point only takes the frequency off of the right sweet spot. As needing those things really only proves that the device is NOT running at the right working frequency. And the use of those things only helps to partially compensate when running at an incorrect or off frequency. But, the best thing is to be spot on, as from the looks of the light coming off of your leds, Slider, they still look pretty dim. No offense meant.
   I'm still having a hard time with this project. My running frequency is at 60Hz, now, no matter what I do. I can change most every component, and still only see it running at 60Hz. I still have not found the reason for this.  And whats worse is that now, the oscillator won't kick on, at all. But, the scope is reading 60Hz, and if I touch the transistor like on the base, or the end of the L3 the voltage goes to several hundred volts, yet an led on a diode loop won't light. WTF!!! 

  As Gyula is our wizard here, I would like to ask for help. Yes, more help, that is.
  What seams to bring the device out of the closet, is touching certain parts, as it seams to need a return ground connection, or more capacitance.  Or... who knows what.
   If you guys are still needing to use a clip lead to see the led "take off", that only proves that you are not running it at the right frequency. As the Doc does not need to use a clip lead to see some results, at least not now, although the diode loop may work similar be a sort of clip lead, as well.

   I suggest you really replicate what the Doc is showing, otherwise you'll just get side tracked onto making a JT, or a normal exciter, with no OU, or anything else of interest, here. Which is NOT the point.  The point of this venture is to tap the aether, or the surrounding ambient energy available, or whatever you want to call it. And to see some positive OU results, or possibly even self running, from an anomaly of sorts. As well as to learn what it takes to get there.  Not just partially lighting some leds off of a battery, on a just a few mAs. As fun as that may be...

[itsu]

Hi Itsu,

Thanks for the video and all your efforts.

From your earlier posts I understood (maybe I misunderstood) the 40 MHz appears only when the 5 kOhm trimmer pot reduces the 12V supply voltage to the oscillator, you did not write that you set the variable cap towards its minimum value. Now you showed you detuned the toroidal tank with the 6 to 60 pF variable capacitor and I assume the 40 MHz operation occured when you detuned the tank also yesterday, right?

The explanation for the 40 MHz operation is this: When there is no resonant collector impedance at 13.5 MHz because the tank is detuned from 13.5 MHz towards the higher frequencies, then the transistor simply cannot amplify high enough at the base frequency any more but it can amplify with enough gain near the 3rd harmonic because the tank impedance has become higher somewhere in the 25-40 MHz range the 6-8 pF variable cap set its resonance, so the crystal jumped to overtone mode. This is all. We can step over this 'issue'.

I think the many harmonics appear because probably the tap is not so good for the transistor operational point when reduced supply voltage feeds the collector. For the BC337-40 probably a higher than 100 kOhm base resistor would be better, think of the base current calculation. But no need to deal with this because:

I think now if you wish to continue tinkering with this circuit, a better transistor type should be obtained.  Then it could be mounted on a heat sink if needed and will not blow from the higher peak collector voltages either. 

Thanks,  Gyula

Gyula,

you did not misunderstood, it was (is) the case that by setting the 5K pot to minimum (0 Ohm), or omit this
pot then the oscillator went into 3th harmonics operation, without touching the variable cap, but this was
without the virtual ground cliplead.

For video purposes i also rearranged (cleaned up) the circuit which also seem to have some influence on its
operation, so i am sorry for the confusion.

So yes, in the video the 40MHz operation occured when detuning the tank.
With the virtual ground, i cannot set the 5K pot to minimum nor can i direct attach the 12V supply
to the circuit as it will blow the transistor, but when i remove the cliplead and retune the thing it
probably behaves again like before (going into 3th harmonics at full supply voltage without retuning the
variable cap).

I can try that again if you like, but i think you are right and i need to go for a better transistor.
I will order some as i was not able to locate any suitable one on my circuit board pile.

Itsu

[itsu]

Slider,

yes the FFT function is a valuable asset of a scope, but it need some learning curve to use it and its
different to manage on each scope.

It surely shows nicely the harmonics of the signal that you look at FFT wise and can be used to aim for
a clean signal (all or most power into the base frequency).

Itsu

[gyulasun]

Hi Itsu,

I think it would be better to obtain suitable transistors first. Similar to the types I gave examples earlier, maybe you can locate them near to you, not just at mouser.com  The goal is at least 80-100V or higher collector voltage rating and higher than 140 - 150 hFE and at least 0.5 A collector current rating.

Gyula

[gyulasun]

Simple Tesla coil L1 Pri 1mhry with L2 3 turns 0.4uh, with NE555 driving with very narrow pulse drive from current driver and FET at 60khz
Tesla coil is not in any kind of resonance at all. Led display is verry bright with pencil earth to garden earth.

AG

Hi AG,
Just a curious question: how do you know that one of the harmonics of the narrow 60 kHz pulses do not just hit coil resonance?   
IF you could change the 60 kHz frequency by a potmeter at the NE555 and sweep up and down say 20 - 30 kHz and see the change in brightness, that would be a good test for that.   OR you may have done so?   

I think though that your aim was mainly to show an increase in brightness when a kind of ground is introduced to the bottom of the load which is fed from the top of the coil.

Thanks,   Gyula