Kapanadze Cousin - DALLY FREE ENERGY

[NickZ]

  Bat1Robin2:
  As I had mentioned previously it does not matter what frequency, or duty cycle is used, the fets will overheat in a few seconds running.
  The duty cycle is not too high, either, as can be seen in the scope shot. The bulbs will barely light with a lower duty cycle. And running at any higher frequency will not light the bulbs any better, but worse, instead, which are already pretty dim.
  I do need to use a higher frequency, but, the frequency pot will not go much higher, and as I can still hear the ringing, I suspect that something is not right, as well, of course.
I can only hear up to about 11.500khz, no higher as I'm 65 years old. My previous Mazilli yoke circuit did not make any noise at all, nor do  Ruslans or Akula's device.
  That is also as good a scope shot as I can take, if I get the camera any closer to the scope, it stops working and will freeze. In any case, I'll see what I can do about that. My PSU is 24v, 10A, and has current limiting protection circuitry.
   Thanks for your comments.

   Hoppy, I think that the reason that running on a single fet improves the output at the bulbs is because it then will run at a lower frequency on just one fet, instead of running on both. It will also heat up the single fet even more. So, there's no advantage there.

[Hoppy]

 
  I do need to use a higher frequency, but, the frequency pot will not go much higher, and as I can still hear the ringing, I suspect that something is not right, as well, of course.

Nick,

You can increase the frequency by reducing the value of the cap on pin 5 designated 'CT'.

You will need to experiment with snubbers to achieve less heating of the fets, or use the yoke 'lossless clamp' configuration suggested by Verpies. Have you got adequate heat sinking? if you are still using the heat sinks shown in your attached photo in post 17010, then these in my opinion are far too small. Use new heat transfer pads or good quality thermal paste.

Don't expect clean waveforms with the yoke connected, even if you have adequate snubbing.

[AlienGrey]

Nick,

You can increase the frequency by reducing the value of the cap on pin 5 designated 'CT'.

You will need to experiment with snubbers to achieve less heating of the fets, or use the yoke 'lossless clamp' configuration suggested by Verpies. Have you got adequate heat sinking? if you are still using the heat sinks shown in your attached photo in post 17010, then these in my opinion are far too small. Use new heat transfer pads or good quality thermal paste.

Don't expect clean waveforms with the yoke connected, even if you have adequate snubbing.

Not trying to be clever but please disconnect the power first
The other thing is Anyone know where I can get a decent pair of deflection coil 'formers' from ?

[Ed morbus]

Go to eBay

deflection Yoke

[Bat1Robin2]

Nick,
Your either pulsing too long or you have the output shorted.
Im giving you frequency and pulse width info that runs the most efficient if that blows fets then you must have a short on the output.

What is your load on the secondary 28 turns of the yoke, i use a single 60 watt bulb for testing.
What is your snubber circuitry, i use only a surge protector over the source to drain for testing.

What is your FET supply voltage and amp draw i use 24 volt DC . single bulb load is about an amp on consumption. 50 volt or so is about the maximum output a the bulb during testing.

This is a simple transformer thats not properly weight matched. (meaning the weight of primary should be the weight of secondary)
That is probably why its in the 70% efficient zone.
step up transformer with 12 windings center tap then 12 more windings.  28 winding secondary.  extra 4 windings not really matched properly so leave it disconnected for start, it will only increase output slightly if connected in the correct polarity.

dc to dc power supply with torroid core and with an extra grenade coil in series with the output to somehow collect radiant from the tesla circuit.
just my opinion,
Good luck to getting it running.