Kapanadze Cousin - DALLY FREE ENERGY

[Hoppy]

Hi Geo. It's not so fun when that happens.
I see you are still powering from the grid. As has been mentioned here before,
this could give you some misleading results. Potential for ground loops and all that rot.
Better to power from a battery bank, if at all possible.

That point needs to be hammered-in!

[Hoppy]

   
And each new version is much more advanced and complicated, with higher output, longer 40 meter long earth ground lines, and needing special components. Like HV, HF diodes the will rectify the output from the 168t coil, to DC, and not go up in smoke, like half my Mazilli crt did, last week. 

Nick,

Both yours and Geo's devices suffered the same fate. The HV will simply find a convenient loop path and eventually break-down and smoke components. A ground connection helps to dissipate the energy but the more current drawn into the device by an increasing load, coupled with an impedance mis-match, will ultimately lead to smoke. This is why voltage suppressors need to be employed to ground out voltage transients before they become too high and exceed component ratings. The same thing is likely to happen when you re-build your circuit unless you have some control over the current available to your device.

[magpwr]

Nick,

Both yours and Geo's devices suffered the same fate. The HV will simply find a convenient loop path and eventually break-down and smoke components. A ground connection helps to dissipate the energy but the more current drawn into the device by an increasing load, coupled with an impedance mis-match, will ultimately lead to smoke. This is why voltage suppressors need to be employed to ground out voltage transients before they become too high and exceed component ratings. The same thing is likely to happen when you re-build your circuit unless you have some control over the current available to your device.

hi Hoppy,

I do agree with you somewhat.

Among the replicators i think Nickz must have spent alot "Cost wise$$" in replacing mosfet after mosfet due to Mazilli tendency to fail since it's also operating at around 50% duty cycle.The dead time between mosfets just isn't long enough in nano seconds.
I do know the mosfet isn't cheap.The wastage in dollars could have been prevented by getting a PWM circuit or just assembling a pwm circuit on a breadboard to save time/money.

In the end -It's up to the individual ardent circuit replicators to decide on how to lower cost just by preventing any kind of circuit failure/smoking.

For Geo case i can't tell if he used a snubber to protect mosfet.
600volts or 400volts rated mosfet is definitely more safe bet as compared to a 200volts rated mosfet.

----------------------------
My progress is very slow ,nearly completed PWM circuit on a Veroboard with smallest heatsink/fan form factor.
I thought i would never touch a veroboard after going PCB.But to save designing time i got no choice.Problem with PCB i need to get all other circuit into it as well to optimize pcb board.
Creating a pcb board itself takes less than 1/2 a day for me.

I will just create a one time youtube video to show everyone on how to create a full proof PWM circuit that works from 9volts all to the way to 350volts dc since i am using  1.2kv mosfet.
After which anyone whom wish to stick with obsolete TL494 with higher component count in circuit "God bless you".

I will reveal my diy version of PWM circuit in matter of days which will be smoke proof "Circuit breaker for 12volts or 24volts 5Amps or  8Amps" as well as long you stick with parts used.

Circuit breaker already saved me hundered of dollars in preventing a smoked mosfet for few years.Unfortunately many replicator or hobbyist never thought about this cost saving device in the long run.

[Hoppy]

Hi Magpwr,

Nick is at a disadvantage in that his knowlege of electrical principles is weak, so he does not yet fully understand how best to protect his device. Hopefully he will take-up your suggestion to employ a circuit breaker to help minimise the risk of further blow-outs. He is further disadvantaged by long lead times in obtaining components. However, I do hope he takes the plunge and attempts to build a PWM, maybe the robust design you intend to show, as this will enable him to develop build skills, which are essential for this type of circuit development and experimentation.

[NickZ]

  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 possibly Geo's as well.   I've now made a new mediator coil (picture below), and I will continue on using that one, when I can.
  There is already over current protection in the PS. But, That is not the problem. Even with my limited electronics knowledge, that much I know.
  However, I did see some integration of the Kacher circuit to the induction circuits, which I've never observed previously to the same degree.  I hope that my new mediator will work better than the yoke/mediator I had used. In any case I'll buy more fets, and anything else that I'll need. Which at this point is undecided just what parts I really need at this point.
  I'll will also buy the $7 PMW/TL494 board, that Itsu recommended me to try output. Again it's a months wait.

  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.