Kapanadze Cousin - DALLY FREE ENERGY

[verpies]

You should be.  That was a perfectly good alligator clip you destroyed.   

I read somewhere that he was bitten by one and he hates them ever since.

[NickZ]

  Hoppy:
  I previously had 6, 6 turns for the primary, and now I'm using 12, 12 turns, but, the PS won't drive the Mazilli at 24v, yet.
So, I'm using 12v battery, for now. I was hoping that the additional turns on the primary would reduce the fet heating, instead.
But, it's acting as if there is a short circuit, as soon as I connect up any bulb.  I still don't know what the cause is.
I've changed and replace every component, except for the 18v zener diodes. Maybe I should replace those as well.

[Hoppy]

  Hoppy:
  I previously had 6, 6 turns for the primary, and now I'm using 12, 12 turns, but, the PS won't drive the Mazilli at 24v, yet.
So, I'm using 12v battery, for now. I was hoping that the additional turns on the primary would reduce the fet heating, instead.
But, it's acting as if there is a short circuit.  I still don't know what the cause is, I've changed and replace every component, except for the 18v zener diodes. Maybe I should replace those as well.

Nick,

It is possible that the increased inductance of your primary winding has caused high voltage that has shorted a zener. However, although you could remove the zeners when running on a 12V supply, there is still a likelihood of damaging the mosfet gates. I suggest that you reduce the number of primary turns prior to removing the zeners. Go back to 12 turns with centre tap (6- CT- 6) and try running at 12V whilst monitoring heat levels. Adding the additional fast diodes as recommended by TK is also advisable.

It is important whilst experimenting to be able to limit the current available from the source supply. A good bench PSU would be a valuable addition to your bench. However, an effective current limiter can be made up by using 12V halogen lamps in parallel / series combinations. The series choke helps to limit the initial pulse current that could rupture the mosfet junctions but this alone will not protect your Mazilli from damage if for example your supply voltage and inductance value is causing excessive pulse current / voltage transients resulting in damage to your mosfets.

[NickZ]

  So, I'll replace the 24v yoke with the previously used 12v 6, 6 turns one, and see what happens.

[itsu]

Hi Nick,

i still had a Mazilla circuit and a 2 x 5 turn primary (38 turns secondary) yoke to drive it.
It should work without heating up the MOSFETs as can be seen in the below video.

Input about 25W (12V / 2A) and load is a 220V / 40W bulb which will light up about half way.

If your circuit is similar it should behave similar, if not there must be something wrong.

Video here:   https://www.youtube.com/watch?v=G7xlQdorYsI&feature=youtu.be

(i can also put 24V on the Mazilla, and  still then the MOSFETs not get hot).

Regards Itsu