Singing Tesla Coil

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testardo

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Tags: audio coils loudspeaker modulated phase-locked-loop plasma Self tesla tuning

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This is a short video showing a PLL tuned 4.5MHz tesla coil with an audio modulator "singing" Tim O'Brien's "Fiddler's Green".
For more information, have a look at: http://users.skynet.be/BillsPage/PLLTesla/PLLTeslaPage.html or go to the 4hv forum at http://4hv.org/e107_plugins/forum/forum_viewtopic.php?16969

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Also, in your ... ( 6 months ago by AgentCROCODILE)

Also, in your schematics, you haven't labelled the pin numbers. Can I assume you are refering to the pins as they appear physically on the package?

Forgot another ... ( 6 months ago by AgentCROCODILE)

Forgot another thing... how do you connect the PLL output to the PWM circuit.

Yes like the first ... ( 6 months ago by Szajbave)

Yes like the first on the left side is pin 1 and so on

You dont connect ... ( 6 months ago by Szajbave)

You dont connect the PLL output to the PWM circuit. The drain voltage of the RF PA transistor is modulated

Yes, the pins are ... ( 5 months ago by testardo)

Yes, the pins are laid out in their physical positions. I should mention that the linear range of the TL494 modulator is not so great, although you can get some decent results for low levels. I am looking at ways to improve its linearity (Class-D type amplifier, perhaps)

But from what I ... ( 5 months ago by AgentCROCODILE)

But from what I read on the 494 datasheet, the limit is 200kHz. So this may not work with all resonators.

Why the fariday ... ( 5 months ago by BenHutchinson1)

Why the fariday cage? If you are in a lab designed for this kind of thing, the equipment you are using should be resistant to EMP.

Well..let's hope I ... ( 5 months ago by testardo)

Well..let's hope I do not need to contend with EMP (electromagnetic pulse; usually associated with nuclear detonations);) I use the Faraday cage to reduce my exposure to HF fields and to reduce possible RF interference to radio service in the 4-5MHz band and its harmonics.

The clock of the ... ( 5 months ago by testardo)

The clock of the TL494 is not what drives the resonator. The VCO (frequency divided by 4)in the PLL chip drives the resonator. The drain of the final power amplifier is modulated by the TL494 circuit.

You have a SSTC ( ... ( 5 months ago by BenHutchinson1)

You have a SSTC (not a SGTC) I assume. But aren't the SGTCs the only tesla coils capable of causing RF interference (as a result of their very broad band signal). But an SSTC shouldn't have a problem. And you said to protect yourself from RF fields. But aren't RF fields at only 4 or 5 MHz pretty safe? To get cooked you have to have closer to 1000 MHz and above (like with microwave ovens). And why are you talking about harmonics? Dont SSTC produce pure sine wave RF signals for the HV output?

So you have it set ... ( 5 months ago by AgentCROCODILE)

So you have it set up like this:
1. Source driven by PLL 2. Drain driven by TL494 Let me know if I'm missing something!

Any device that ... ( 5 months ago by testardo)

Any device that generates significant RF power can be a source of interference. I measured significant harmonic content beyond 60MHz (5m wavelength) with this coil using a spectrum analyser...so it is important to be careful to reduce possible radiation. As for being cooked...it's not likely as long as you don't get too close, but why expose yourself to more "electromagnetic smog"? A glass of water placed in the resonator will absorb significant power. This might indicate a need for prudence

You got it!! ( 5 months ago by testardo)

You got it!!

Oops.. I was a ... ( 5 months ago by testardo)

Oops.. I was a little hasty in responding.. MOSFET _gate_ driven by PLL and drain driven by TL494. Cheers!

Using GDT? ( 5 months ago by AgentCROCODILE)

Using GDT?

Over 60MHz ... ( 5 months ago by BenHutchinson1)

Over 60MHz harmonics? But how? Doesn't your tesla coil put out just a pure sine wave?

Have a look at the ... ( 5 months ago by testardo)

Have a look at the schematic in the technical notes on the web page listed in the description info for this video. I put a bit of effort into this document, so please read it if you want to know a bit about how this circuit works. You will see immediately whether or not I used a GDT.

How can it just put ... ( 5 months ago by testardo)

How can it just put out a "pure sine wave" when that MOSFET switch is banging it every 200-250ns with a fairly square current pulse? I think you need to do a bit of reading on harmonic generation in switching circuits.. Google "Fourier Series" for a look at periodic nonsinusoidal wave representations... Cheers!

But I thought that ... ( 5 months ago by BenHutchinson1)

But I thought that most SSTCs had filter circuits between the switching transistor and the primary winding of the Tesla Coil.

are you Belgian ? I ... ( 5 months ago by sydalfox)

are you Belgian ? I see you use a skynet-account

No..I am not a ... ( 4 months ago by testardo)

No..I am not a Belgian, but I have been living in Belgium for a couple of years now... Strange little country...de nederlandstaligen et les francophones can never agree on anything! ;-))

Your descriptive ... ( 4 months ago by peguie)

Your descriptive page is great :)

Hooooooly sheit ( 3 months ago by Dryvnt2)

Hooooooly sheit

tim obrien is great ... ( 1 month ago by jt1122)

tim obrien is great i love his stuff and this is also a cool tesla coil very impressive

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