Kapanadze Cousin - DALLY FREE ENERGY

[itsu]

With some more careful measurements.
Inductor line is in place, without connecting yet the 28t yoke secondary. Inductor 18.75m, three layers of 25T. Voltage across cap 1.12KV pk-pk without load. With a load of 40W, voltage across capacitor 750V. The reason for these higher values is the higher inductance (3X25T). Dc voltage across the output capacitor, 180V without load, 100V with the 40W load connected. 30V with 500W load, 20V with 1KW load, and about 10V for 1.5KW.

Itsu. At the ends of 28T coil I connected a bridge and a filter, for supplying later some dc voltage to my Tesla coil stage. It outputs there 275V dc without load. Is it too much to feed with this my irfp460? I remember' that your supply was close to 130V. Did you have any protection for irfp460? Any problems?


Ps.1 Thanks for the video and the polarity info. I will first make my HV stage and then I'll try it.

Ps2. Frequency drifting in relation with coil temperature confirmed. So different load is not the only factor of detuning. Pll is a must.

Jeg,

the IRFP460 can handle 500V drain / source voltage, so besides some possible spikes it should be OK.
I did use 130V drain / source voltage, but with a very low 200ns driving pulse.   
Only protection was an 18V TVS across gate / source (and the 1K resistor from gate to source and the 4.7 Ohm source/sink resistor per Olegs blue box).

Only problem (with the Kacher) was that my DECT telephone started ringing when firing up, sparks would fly from every bare metal, my laptop computer crashed, a current probe got fried and one part of a dual PS went up in smoke, thats all 


My inductor coil is 2 layers and about 11m long, so less inductance.

Itsu

[Jeg]

Geo
Thanks for sharing your experience. My new push pull uses ground plane. Its operation has been improved enough only by this addition. Insulated yoke halfs as Itsu describes, and a plastic screwdriver

Geo, in addition the most of the chaotic mode as you call it has disappeared due to the fact that akula's snubber has been corrected and so there is not ringing across the yoke. Those random frequency spikes at drain is the main reason behind 'chaotic mode'. See at previous pages when we were discussing about this if you would also like to improve it.     

[Jeg]

Jeg,

the IRFP460 can handle 500V drain / source voltage, so besides some possible spikes it should be OK.
I did use 130V drain / source voltage, but with a very low 200ns driving pulse.   
Only protection was an 18V TVS across gate / source (and the 1K resistor from gate to source and the 4.7 Ohm source/sink resistor per Olegs blue box).

Only problem (with the Kacher) was that my DECT telephone started ringing when firing up, sparks would fly from every bare metal, my laptop computer crashed, a current probe got fried and one part of a dual PS went up in smoke, thats all 


My inductor coil is 2 layers and about 11m long, so less inductance.

Itsu

Thanks Itsu. I knew about your inductor and that is the why I wrote my inductor's specs so to avoid confusion.

Sorry to hear about your loss. Before some days I also lost my DDS 12Mhz signal generator. It was new and the second fg that I fry. I already ordered a new one again from eBay at 24Mhz.
Now that you mentioned this, I'll think it more before procceding. I can't afford more damages.

[T-1000]

Itsu,
There is one thing to do in the series resonance setup - let that power supply support series resonance back on input then see how much power the circuit will take from the battery. This should be interesting to see.

Cheers!

[verpies]

the moment you touch or even get very close to the Duty cycle pot or Freq pot it will hiss and strange noices.

That is a fascinating mode of operation.
Apparently there is some feedback from the output to the control pins of the TL494 but this feedback should not result in a chaotic mode without the "Kacher" - it should be a steady squeal like the one that happens with a speaker and microphone feeding back into each other.