BrovinKacherTesla

[boguslaw]

The upper frequency limit is set by coil self resonant frequency. To lower frequency put capacitor in parallel with either coil. If transistor is not fast enough it can limit frequency also. MJE13007 should work up to several MHz.

Thanks.Seems I resolved problem by placing irf630 between emitter and ground of mje13007 and driving it from oscillator type. Because I'm not good in electronics it took me two days to construct circuit and probably will take another two to make a board in copper. I wonder if I can check the output waveform somehow without damaging scope ?

[xee2]

I wonder if I can check the output waveform somehow without damaging scope ?

Make a two resistor voltage divider. Length of largest resistor value needs to exceed length of spark that circuit can make.

[xee2]

Seems I resolved problem by placing irf630 between emitter and ground of mje13007 and driving it from oscillator type.

I suspect you are turning it on and off which amplitude modulates the signal. And that the actual oscillator frequency is still being set by the coil

[woopy]

Hi Xee2

yes your circuit works, but i can not say if it is better than the other config yet .

But it seems that in any case the connection to a good ground add a lot of output power in my case.

Hi Marxist

I did not test other spark gap as this Epcos (surge arrestor ) in this system.
Probably due to the fact that it worked so well from the first attempt.
Will consider to experiment a open air SG.

hope this helps

good luck at all

Laurent

[xee2]

Hi Xee2
yes your circuit works, but i can not say if it is better than the other config yet

I think they should be about the same. This is my interpretation of your basic circuit. Very similar to basic Tesla coil circuit but you have very unique implementation.

[Guruji]

So this circuit gives more output?

[xee2]

So this circuit gives more output?

Maybe, maybe not. The intent was to try to show a simpler diagram of the circuit so that the functioning of the circuit could be more easily understood.

[xee2]

@ woopy

This is my interpretation of your actual circuit:

[Guruji]

Build this

Today I've build this circuit but nothing is coming
I used 2n3055 with alot of turns secondary and 2T primary. Is it maybe with this transistor I should do more than 2T?
Thanks

[boguslaw]

Today I've build this circuit but nothing is coming
I used 2n3055 with alot of turns secondary and 2T primary. Is it maybe with this transistor I should do more than 2T?
Thanks

Yes, indeed it is hard to get it running especially with low voltage like 12V input. I checked that it runs by using simple device : one turn of wire attached to AV plug and then to LED. LED is lit near the running kacher and even 1.5m far from it. Also the ac/edge electronic detector is indicating field exactly like Don Smith presented in his 2001 video. I have managed to get a nice violet plasma about 1cm long but many times it require then you touch the output wire with a metallic object or ground connection. It looks very nice like a small laser saber. Of course it works if you place coil vertically and output is not attached to any larger diameter wire.

[Guruji]

Yes, indeed it is hard to get it running especially with low voltage like 12V input. I checked that it runs by using simple device : one turn of wire attached to AV plug and then to LED. LED is lit near the running kacher and even 1.5m far from it. Also the ac/edge electronic detector is indicating field exactly like Don Smith presented in his 2001 video. I have managed to get a nice violet plasma about 1cm long but many times it require then you touch the output wire with a metallic object or ground connection. It looks very nice like a small laser saber. Of course it works if you place coil vertically and output is not attached to any larger diameter wire.

Thanks Boguslaw I will try with higher voltage. Regarding the wire around the battery it should be done as a plate yes? I mean all wire shorted.

[boguslaw]

Thanks Boguslaw I will try with higher voltage. Regarding the wire around the battery it should be done as a plate yes? I mean all wire shorted.

Oops, sorry . I said about bare kacher circuit, I don't have the additive woopy used, just bare kacher part.

[Guruji]

Oops, sorry . I said about bare kacher circuit, I don't have the additive woopy used, just bare kacher part.

I saw the woopy vid again and the wire he used is insulated. Ok I try this.

[xee2]

@ Guruji
I recommend using boguslaw approach of getting the oscillator working first and then adding other parts.

@ boguslaw
Congratulations on your success. You seem to have great performance.

[boguslaw]

@ Guruji
I recommend using boguslaw approach of getting the oscillator working first and then adding other parts.

@ boguslaw
Congratulations on your success. You seem to have great performance.

Thanks, but remember that this plasma output is only from the end of secondary wire which is 0.18mm thick. After I connected some piece of HV cable to this end, plasma "laser saber" is lost. Power used : 12V at around 200mA. It took me many days to find a working schematic and figure out that at such low power level it require to touch top terminal with metal to activate.
Also I found it strange that any chokes placed on both positive and negative connection to battery prevented oscillation of circuit.