I tried to rebiuld a Don Smith Device

[Farmhand]

I got this -trumpet-wineglass- wave form from a setup I messed with or is it a swordfish or a sailfish wave form  The secondaries were grounded by the center tap and there was no real load, I had a Gas discharge tube between the secondaries hot ends, the secondaries were tuned by a 3 nF capacitor across both. The no load situation is why the waveform increases in amplitude I think. I see nothing O.U. about it. A load would soon put an end to the increasing amplitude wave form I think.

Don Smith tuned his secondaries with capacitors as well, look at the pictures. And my coils are both wound the same way, just as Don Smith described. Not opposite, as he never mentioned that. He even described how he made his coils from one longer coil, which means they are both wound the same way.

Video of wine glass-trumpet wave form ( Sailfish is a better description of what I see.)
http://www.youtube.com/watch?v=EjuE91-qXu0

Try it and see.

P.S scope probe is hanging in free air about 12 inches from the secondaries, in no particular orientation, I think it was closer to one side than the other.

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[Google]

Farmhand,

I saw 2 spark gaps in your video, spark plug was for the primary I believe, where was the second one, tube type, connected and why ? I could not find that in the market at all. What is that and where originally its used ?
What is its function in your circuit ?

I read 123 page Don Smith pdf and made notes. Which circuit you have used ?

Best,

[Google]

Here is a good help while tuning the coils

http://radio-timetraveller.blogspot.in/2011_12_01_archive.html

Best,

[Google]

The primary in dons device acts as a tuned radio antenna and secondary as tuned radio reciever IMHO, if we somehow cancell the electrical part of the transmitted waveform and recieve only the magnetic component of the waveform to induce our multiple secondaries in close viscinity of 1/4 of the wavelegth.

What would be the result ? Any thoughts ?

Best,

[Farmhand]

That the second spark gap is between the secondary "hot" ends, it is a 2000 volt Gas Discharge Tube and I put it there to check the output voltage, as we can see the GDT discharges only once with every discharge of the primary spark gap.

The circuit is simply two 20 Turn secondaries joined to make a grounded center tap with the primary between, this makes one secondary side negative while the other side is positive, the two secondaries are ground potential in the middle and opposite alternating potentials at the ends, I tuned the primary and it's capacitance to the same frequency as each of the secondaries separately, I think or a harmonic, it was a while ago. I still have the setup on it's wooden frame, and I will use it for other experiments.

I am aware of how to tune things to resonance. It's actually quite easy.

Here is a 1 minute run of my over 700 khz Tesla transformer, it has only about 220 turns in the secondary and extra coils together and one primary turn 360 mm in diameter the secondary is 360 mm in diameter and the extra coil is about 120 mm in diameter. The power is restricted primary side and secondary side, the break rate of the rotary gap can go to well over 1000 BPS but works best at about 400 which is when the resonant charging circuit is in tune. Max input power is about 680 Watts, but I rarely use that much. I plan to remove the primary power restriction soon. I'll post the supply circuit for the Tesla coil soon.

Tesla coil 1 minute run, over 700 Khz res frequency. A bit high for a sparking coil. I vary the break rate during the run and we can see the rope type discharge is quite powerful and happens a certain break rates.
http://www.youtube.com/watch?v=1nkJtrKCdFg

Just have a look at the thread here http://www.overunity.com/13935/tesla-coil-build-comparison-proof-of-ability/#.UyPPb_mSwls

Tinsel is a lot more knowledgeable than me so I take it easy so I stay alive.  Very dangerous is one way to describe these activities and experiments.

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