Kapanadze Cousin - DALLY FREE ENERGY

[starcruiser]

As far as the Tesla secondary, when checked without the top load coil it was around 1.5Mhz, when I added the top load, without the inductor in between, it dropped the operating frequency to about half (see my earlier post). I am thinking this inductor might offer isolation between the top load and secondary to avoid detuning the Tesla Coil (i.e. dropping the operating frequency). Need to validate this theory with a test.

My target operating frequency for the Secondary of the Tesla coil is 1.8Mhz roughly, this is why I wound it with the length I did, my Grenade coil (larger coil) is wound/tuned to 1/2 wave or 900 (ish)Khz and my check does validate this. My calculations were based on wire length for wavelength desired, along with the circumference of the form (and subsequent circumference of the layers) and the diameter of the wire (including insulation) to determine the number of turns required per layer. I can tune the Tesla secondary by removing turns to increase the operating frequency to match up the coils, this was expected thus the way I wound it and used tape to hold the end closest to the 12gauge coil. I figured the Tesla coil would be easier to tune than the grenade coils.

I am thinking in regards to the zero crossing is required since the logic gate circuit is used to delay the Tesla trigger signal and allow adjust-ability to place the pulse where it will do the most good (reliably). In the circuit design he is showing a delay to allow alignment with the current waveform.

I am thinking everything must be close in wavelengths or damn close, if this device operates on resonance and current kicks from the Tesla coil.

Just my thoughts on this design thus far.

[starcruiser]

Good day NickZ

Could be a Half-bridge driver, I do see some red color poly caps that would fit the build.....................

Not enough info to go on............yet!

I would bet that he keeps changing the design to try to beat the overheating issue with the FETs/BJTs and or diodes....... which make me think what really is the modus operandi of the unit?  Avalanche, Tunneling, Quasi-linear operation or just Uber-high frequencies and insufficient engineering?

take care, peace
lost_bro

Perhaps the feedback from the BEMF is causing the heating??? This is something that all have experienced thus far. could he be looking for a better clamping design?

[lost_bro]

As far as the Tesla secondary, when checked without the top load coil it was around 1.5Mhz, when I added the top load, without the inductor in between, it dropped the operating frequency to about half (see my earlier post). I am thinking this inductor might offer isolation between the top load and secondary to avoid detuning the Tesla Coil (i.e. dropping the operating frequency). Need to validate this theory with a test.

Good day Starcruiser

You hit the nail on the head with that observation:

Check Tesla's Colorado Springs notes regarding the 'Extra Coil' and his tuning advice.

Haven't read the T.C.S. notes in years, but what I remember is that he utilized a *decoupling coil* between the Secondary and the extra coil for that stated purpose......................  The 'Extra Coil' is galvanically connected to the secondary but, it is *free* to resonant without effect from the secondary.

take care, peace
lost_bro

[Dog-One]

I also think Ruslan is using 20 gauge wire on the Tesla secondary, so unloaded this coil would probably be in the 10-15 MHz range.  This makes it interesting to think about how the little ferrite rod bucking coil arrangement between the Tesla secondary and the antenna actually plays into this whole design.  The relatively thick secondary wire and short stack means there is a pretty low turns ratio, which would explain why he uses a separate high voltage drive circuit.  I'm guessing the IR2153 circuit boosts voltage to somewhere between 100 and 200 volts, which is triggered across the primary.  The secondary then probably has pretty good amperage compared to a typical Tesla coil setup.

[Dog-One]

Perhaps the feedback from the BEMF is causing the heating??? This is something that all have experienced thus far. could he be looking for a better clamping design?

When you guys speak of heating, do you mean the MOSFETs or the snubber resistor?  I'm only seeing a problem with the snubber and I suspect it's because my nanocrystalline core isn't quite a perfect match.  Something that did help me though is to use much smaller electrolytic caps on the power bus, upstream of the voltage regulators.  This cuts the ringing when power is forced into the toroid/yoke transformer, but it doesn't do anything when the MOSFET switches off--still see ringing there and the snubber resistor ends up eating the wasted power.