Kapanadze Cousin - DALLY FREE ENERGY

[NickZ]

   Grum:
   I'm reading the voltage with an analog meter at the bulb. There is no high frequency, or high voltage with this set up. The bad part is it only gives me 1/10 of the output that a single transistor Joule Ringer circuit can give. But, that is using a different core, a TIP 3055, and a ferrite bead core with a high voltage mag wire secondary, reading 1000+ volts, and unknown amps.

  Anyway, I thought that I'd try it with those transistors, just to see if there was any difference over the IRF620 Fets that I had on previously. 
  You are right the transistors have not blown, so far. But, they probably would if I input 24v to them, as they already are getting warm, even with the heat-sinks after a while.

  One more thing that I've noticed... Is that when the "long-ish sparkler type sparks" are  seen on the circuit, as when touching the battery terminal to connect it up, the better the output. These longer sparks mean a safe output, one that does not shock at all, and still lights several incandescent bulb, (haven't try it in water).
Which is still like seeing magic happen,  to me.

[skywalker66]

  Isn't that what the choke is supposed to do?

Choke limit current only in normal operation, but if happen that circuit stop oscillating from some whatever reason, the choke is like a dead short in your circuit, and then only a power supply with current limiting will save your transistors.
I personally use a 12V-15V power supply with current limiting at about 10A for such royer/mazzili experiments, and never burn any mosfet with that.
So for the future if you wish to save your fets, try put let say 2 or 3 halogen bulbs 12V/50W rated parallel mounted, and in series with positive terminal of your battery is a cheap solution for avoiding burning more fets.

  I did buy some 12v zeners but have not tried them yet, until I can get more fets.  However, they may not be the right ones, either.
  Package says: # IN4742A   12v,  21mA, maximum power dissipation 1.0 W 
  So, are these any good for this? They were the only one that I could get from the Shack.    However,  I don't see Igor using them so far.

Neither I not use zeners in my royer, but that is safe if power supply don't exceed let say 18V.
Igor for instance use a 12V car battery, so he don't need zeners too.

Regards !

[skywalker66]

  One more thing that I've noticed... Is that when the "long-ish sparkler type sparks" are  seen on the circuit, as when touching the battery terminal to connect it up, the better the output. These longer sparks mean a safe output, one that does not shock at all, and still lights several incandescent bulb, (haven't try it in water).
Which is still like seeing magic happen,  to me.

That part I hadn't understand. Can you detail a little ? What circuit do you referring to ? and spark where? Igor use a spark in his circuit too and I think he get some effect with this.

[Hoppy]

Choke limit current only in normal operation, but if happen that circuit stop oscillating from some whatever reason, the choke is like a dead short in your circuit, and then only a power supply with current limiting will save your transistors.
I personally use a 12V-15V power supply with current limiting at about 10A for such royer/mazzili experiments, and never burn any mosfet with that.
So for the future if you wish to save your fets, try put let say 2 or 3 halogen bulbs 12V/50W rated parallel mounted, and in series with positive terminal of your battery is a cheap solution for avoiding burning more fets.

Neither I not use zeners in my royer, but that is safe if power supply don't exceed let say 18V.
Igor for instance use a 12V car battery, so he don't need zeners too.

Regards !

Yes, power supply current limiting is an important and a fundamental requirement when experimenting with electronic circuits. Most of us serious experimenters have current limiting bench PSU's and this is one of the first basic bits of equipment that is needed for electronics work.

I've personally destroyed mosfet gates with supply rails less than 18V, so my advice to Nick is to fit the zeners from the outset, as he is bound to want to run his oscillator at voltages above 12V at some point.

Good tip suggesting the use of halogen lamps as current limiters when running direct from batteries.

[NickZ]

  I'm using a small 12v 4.5 battery on my Royer, as is seen in the pictures that I posted.  Last night while tinkering with the transistor Royer circuit, I was able have it kick into the higher resonant mode, by placing different value caps on the primary yoke coil LC tank circuit.  Found a cap that kicks the circuit into the higher output mode. Just like Itsu has shown.  Only problem was that after about 5 minutes running , the big switching transistor lit on FIRE (circuit still working, light still on) and then it went up in a big puff of smoke. You should have seen it...
The bigger they are, the harder they fail. Ha!
I tried to take a picture of it while on fire, but couldn't get the camera together to do so, fast enough.
  So, my reputation still hold true,
                                                   "Nick the Smoke"