Kapanadze Cousin - DALLY FREE ENERGY

[Void]

AFAIR the original also had the copper foil on the "flat part" but that part was wider on the original yoke core.
However, I am not certain whether the copper foil was allowed to be in the gap between the core halves - instead there might have been a wire bridge soldered to two separate pieces of the foil before the gap.  I remember a diagram of it on this forum (see here) and Wesley talking, that there was only paper in the gap.  The thickness of this gap is evidently very critical, so the thickness of any materials within the gap must be critical, too.
I don't think the core needs to be wrapped in an insulating plastic tape, under the copper foil, because the original black core had a very high resistivity, as far as I remember.
Actually, the unimpeded contact of the copper tape with the naked ferrite might be responsible for some effect.
These points should be consulted with the people who worked on this device ...and settled once and for all.

Thanks Verpies. I missed that in the video about using the copper wire jumper to get around the problem
of having the copper strap going through the gaps. Yes, the DC resistance of my yoke core appears to be
very high. I don't get any reading on my multimeter even on the 200 Megaohm scale.
It would be nice if I can get some feedback on this setup from T-1000 or Wesley, so I get things optimal/correct right
from the start. At least with the narrow copper strap I have on my yoke core right now I can still try the test
to search for a magic frequency. I plan to give that a try today. I will post back my results here.

[magpwr]

  Magpwr:
   Thanks for considering the cost of the fets. Which by the way aren't expensive at all, but are not easy for me to obtain by turtle mail from China, as it takes them about a month to get here.  My costs are not from the price, but on availability or time needed to replace components.  But, in any case after a couple of years at working on these devices, I've not spent over $50 for parts.  Test gear is a different story.  And Geo managed to do it all, up to where he's at now, with NO test gear.

  The reason that my Mazilli bit the dust was due to my testing the "Mediator" coil that I used. That has NOTHING to do with the Mazilli, as being touchy, finiky, or problematic. As the mediator coil that I used (tv yoke) allows too much current to pass through it, compared to the two or three smaller chokes that I normally used instead.  That is the cause of both my burn out, and probably Geo's as well. This mediator coil.  I've now made a new mediator coil, and will continue on when I can.

  Magpwr: All I've seen from any of the PWM boards anyone has used is lousy output, and fried components.
Not very convincing...
We'll see what you come up with.

hi Nickz,

I agree with you shipment from China can be long.Since i am living in Singapore within Asia.It typically takes 2 to 4 weeks depending on which seller in China.

Unfortunately this is the worst time for anyone ordering anything from China since it's their grand holiday due to Chinese New Year around this time of the year.2 weeks holiday i believe.
It will now take 1.5 months to nearly 2months to get your parts.Don't worry i think i am effected as well as i placed order around 1 week ago.

PWM circuit for any purpose might be using either mosfet or IGBT.
Heat is generate from Mosfet or IGBT not only because switching at high current.If a 40Amps Mosfet which need 15volts or 18volts at the gates generate alot of heat.
It also means Mosfet is highly likely under driven at 12volts or less.
This means that a 40Amps mosfet won't function like it was meant for even 20Amps hence unwanted heat is generated from the mosfet.

In simple term efficiency is lowered if there is heat generated from mosfet apart from the heatsink/fan.

It's one of the reason why i like use a voltage boost circuit XL6009 (got 3 of those) to provide high enough signal for mosfet gate.MC34063 is cheap,simple and good as well.
It's more suited for 12volts battery if there is need to isolate from mains supply.

[NickZ]

  Mag:
  My fets don't heat up, even without a heat sink.  That is not the cause of death. And I'm using a 24v, 10A PS with over current protection, for now, until I use a 12v battery for the input source, and use the PS for the feed back path.
  The mediator caused the yoke to go into the "vibrating mode".  And as I wanted to see what this vibrating mode was about, I let it run like that for a minute, or so. That was the cause of death, almost instantaneous, with no heat on the fets. Something else did smoke though, not sure what since several parts fried.  I think that possibly one of the 18v zeners bit it, first, along with both 10k resistors, which then killed one or both fets.  Any way, that hopefully will not happen again. 
 
   

[Hoppy]

 
  The reason that my Mazilli bit the dust was due to my testing the "Mediator" coil that I used. That has NOTHING to do with the Mazilli, as being touchy, finiky, or problematic. As the mediator coil that I used (tv yoke) allows too much current to pass through it, compared to the two or three smaller chokes that I normally used instead.  That is the cause of both my burn out, and probably Geo's as well. This mediator coil.  I've now made a new mediator coil, and will continue on when I can.

  Magpwr: All I've seen from any of the PWM boards anyone has used is lousy output, and fried components.
Not very convincing...
We'll see what you come up with.

Yes Nick. The mediator coil is probably allowing the push-pull to draw too higher pulse currents and you are unable to control the current because your duty cycle is fixed as Magpwr pointed out. Unless you have control over the duty cycle, you could easily suffer a further blow-out, depending on whether your mediator chokes the input current sufficiently. The level of current limitation, will govern the power output of your device.

[NickZ]

  Yes, well I'm working on it, and will use the new mediator coil next time, and watch for problems, if there are any.
  Current limiting can be controlled by the choice of the yoke's primary coil tuning cap(s) on the Mazilli crt. if need be.
   And yes, a controllable duty cycle would be important, or maybe even essential.  Geo's circuit was cutting out at over 30%.
So, if that is the case, then even 50% would be not reachable for him on his TL board. And possibly with limited output, therefrom, also. If he places the 1000w bulb on the device, or the 450 watt worth of bulbs, death of the circuit may be the result. Which he may not have noticed, when running only a single 100w bulb.