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Hah, that's funny. So does it have an oscillator or is it solely driven by feedback?
Its driven by antena(feedback) just like it is in scheme. Teravolt: of course i seen another designs with these synchronization it is those with 74HC109 chip. I am currenlty working with it in my new coil. The reason why I dont want to use it here is because this coil is running just great and I dont want to reconstruct it again, never! And no, I dont measured the frequencis separatly even both, the freqenci it just imaginary in my calculations, but in the future i want to measure it and tune it more and maybe i get even better results.
Registered Member #2315
Joined: Tue Aug 25 2009, 02:35AM
Location: Leyte, PH
Posts: 161
guys,
you know what? THIS SETUP is very intrigueing...
Martin, you said you have tried using other types of oscillations (PLL,VCO,CT) but antenna worked BEST for this setup... my question: how was it with CT feedback? I would really like to know because Im using one right now..
my SSTC (with no cap in series with PRI) works with CT feedback (using 74HC14) from the base of the secondary coil...this clearly shows that WE get oscillation (and resonant freq) through the secondary L and C.... now with the *adding* of C in the primary thus making it ALSO a resonant one, then "tracking" or getting feedback(to sustain oscillation) from THE WHOLE TESLA COIL itself, would be more "difficult"? since obviously your getting your Freso from secondary, and by w/c would be ALSO getting ( I dont know what term to use here) a "kick" from the PRIMARY tank resonant...
hence using antenna AS FEEDBACK was *best* since it of just ANDs or ORs the PRIMARY Freso and Secondary Freso?
just a thought really... Its been bugging me JUST NOW
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
Once you magnetically couple a resonant primary circuit to a resonant secondary circuit, the resulting system does not have a "primary" and "secondary" resonant frequency. The resulting system exhibits two entirely new resonant frequencies, even if the primary and secondary previously resonated at precisely the same frequency.
So, for example, if Fpri=100kHz and Fsec=101kHz before coupling them together. The resulting resonant frequencies of the coupled coil system might be something like 92kHz and 112kHz. There is no resonance in the original region around 100kHz any more!
The two new resonant frequencies are called the upper and lower mode frequencies for the new system. Which one of these frequencies the system oscillates at can depend on the polarity of the TC primary winding, the polarity in which the CT senses current, and any inversion in the feedback path. In some instances the system can actually hop between the two modes more or less at random!
If you're really interested, it is explained here some more:
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
I've never used antenna feedback myself, but it seems to me that it would act the same as putting a CT over the wire leaving the base of the secondary. I just prefer to use a CT since it is compact, out of the way of the flying sparks, and it can be mechanically fixed (therefore is repeatable.)
The antenna is basically sensing a portion of the displacement current from the toroid that is trying to get back to ground (earth.) This current will cause a voltage drop across whatever the antenna is terminated into. I'm sure someone on here did an analysis of this and came to the same conclusion.
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DRSSTC BEAST
And no, I dont measured the frequencis separatly even both, the freqenci it just imaginary in my calculations, but in the future i want to measure it and tune it more and maybe i get even better results.
