Kapanadze Cousin - DALLY FREE ENERGY

[lost_bro]

   Nice video, but those might be overkill, and especially when using two of those boards, at 60 pounds, each.
There are cheaper but possibly not better deals for adjustable Tesla coil drivers, on the internet.
   As all I can get is a weak spark from my current kacher crt, although it can light CFL's ok. But, my HV spark doesn't look like DA1's HV spark, or Ruslan's spark (jumping to his finger), for that matter.

  So, if the yoke was wound with the same primary and secondary turns, but not tapped in the middle of the primary coil.  It would probably still work without having a push pull type of oscillator, more like a regular primary to secondary coil, and still outputting a magnetic current.  Or not?
  Anyways, just some thoughts.

Good evening NickZ

If a *H-Bridge* topology is used to drive the Tesla coil primary a major advantage is that for any given voltage you get twice the voltage swing at the coil (as opposed to single transistor designs).  This generally allows for a greater HV output for any same primary coil voltage input along with the fact that heat dissipation is now between 4 switches instead of just one or two (single/half-bridge).
Most of the *larger* SSTC & DRSSTC coilers use the H-bridge topology for that reason.

take care, peace
lost_bro

[Dog-One]

Just to clarify in my mind..........  the *Kacher* refers to Ruslan's first generation self-resonant single transistor drive topology for the tesla coil primary?  This was the design that resembled the -Slayer- secondary base feedback mechanism for control of the base signal for  single transistor on the primary.  right?

That is correct.  The Kacher circuit has one purpose only -- to find the resonant frequency of your Tesla coil.  It is not needed and not useful beyond that.  If you use a Kacher and then switch to a signal generator, be sure to use the exact same gate driver and MOSFET, otherwise you'll be fighting the delays in the silicon and wondering why you can't get the same frequencies anymore.

If your Tesla primary and secondary is in the ballpark, you can use a signal generator to find the resonant point.  I just did this tonight and mine is currently showing about 10KHz on the fundamental, which is too slow.  The next harmonic is 20KHz which is too fast, so I need to make some winding adjustments.  I also need to raise the voltage a bit more, which means more turns on the secondary, which will force me to use the 2nd harmonic.  Just for reference, I have 190 turns of AWG 21 at the moment.  I'll post the final once I get it dialed in.

So why is Kacher circuit bad...?

Because you need to hard lock the base of the Tesla secondary to ground.  If you don't, the energy generated in the secondary will go that direction instead of going to the antenna where it is needed.  It's just like Ruslan said (again, imagine that), the Tesla secondary is an electric spring--you crunch it down and pops back out.  It will pop in both directions if you let it.  Don't let it leverage against the antenna and pop towards ground.  Make the ground solid so it can only pop towards the antenna.

So can you still use a Kacher...?

You probably could with some work, but you won't be able to use the base of the secondary for your feedback loop.  You'd end up using the antenna side which is going to be high voltage and if you mess with that too much, you'll kill the very signal you want going to the antenna.  You could probably wind a small "extra" secondary and use that for feedback.  I'm saying don't and here's why...

This whole device works on the principals of wavelength and wire length.  The wire length isn't going to change one bit unless you increase the length of your ground cable.  So why on earth would anyone do that.  Calculate your lengths, figure out what frequency you need to be at and use a signal generator (oscillator) to stay at that frequency, permanently.  No mess, no fuss, just simple concepts that T-1000 and others have gathered from Ruslan and Akula.

[Dog-One]

Most of the *larger* SSTC & DRSSTC coilers use the H-bridge topology for that reason.

Also Nick, look at the architecture of a modern Class-D audio amplifier (i.e. TAS5630).  Same deal.  Which is why I'm going to find out first hand how well it will work.
http://store.sure-electronics.com/audio/audio-amplifier-board/high-power/aa-ab31241

[Dog-One]

I will give you all another hint.  When you get the burst figured out and running at the resonant frequency, you should see on the scope at the antenna side of the Tesla secondary, a wave that I'll call a "sperm wave".  You'll recognize it when you see it.  It's unmistakable.  I've also seen this same waveform from a gentleman that has done extensive work with the Stan Meyer process--someone I trust to give me the straight scoop.  You'll know you're there when a CFL blooms to full brightness.

A note to AlienGrey -- This still is not a synchronized burst which is why you see the distortion right at the very beginning.  I'll have that sorted out soon.

[Dog-One]

Got the burst logic figured out too.  Yellow trace is the current sense sine wave and the blue trace is the ten pulse burst to the gate driver.  Sweet!

If anyone knows whether this is approximately the correct trigger position or not, I'm all ears.