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RE: [TCML] Musical Tesla Coils (plasma speakers on steroids)
Thanks for the tip about class E! I was planning on a 1MHz coil. I didn't know there was an audible difference between the two, thanks for saving me a headache trying to "cut out the hiss."
I am planning on modifying a CW SSTC H-bridge circuit to run at a wider range of input voltages. I would like the circuit to begin pushing sparks around 20 volts input. And be mostly linear all the way up to the available 300 volts.
More info on the amp: All the amp does is provide an audio modulated variable input current source with up to 300 VDC output. The voltage will be determined by the current draw of the SSTC. I could just the same use power switching transistors to preform this task but...
I found some very nice (and cheep) 650 watt power mosfets. I would need only two of them in the amplifier circuit.
The reason I want to use a variable input voltage and current to the SSTC's H-bridge instead of using PWM (which is so much easier) is this; AM is the only true way to mimic natural sound waves that will never sound "tinney" of synthetic.
PWM generates waves that change sub-tones of a note which most people can hear.
Thanks for help this far. Any other hints are greatly encouraged.
,Jeremiah Popp
--- On Mon, 2/15/10, McCauley, Daniel H <daniel.h.mccauley@xxxxxxxx> wrote:
> From: McCauley, Daniel H <daniel.h.mccauley@xxxxxxxx>
> Subject: RE: [TCML] Musical Tesla Coils (plasma speakers on steroids)
> To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
> Date: Monday, February 15, 2010, 7:40 PM
>
> One thing is that I don't think you understand the nature
> of the available SSTC designs already available on the
> internet. Practically all of these SSTCs are pulsed
> type Tesla coils which cannot be audio modulated in the
> fashion you desire. What you need is a high power CW
> type solid state coil, and if you want high quality audio,
> you are going to have to go with a Class-E type
> system. There is no way around that - pure and
> simple.
>
> The arc from a CW coil thats switching at less than 3MHz
> will have a very loud hiss associated with it that will
> degrade audio quality considerably. You need to switch
> at least 3MHz (preferably greater than 4MHz) to have a
> silent arc thats capable of producing real high quality
> audio.
>
> Also, seems you are little confused about the 1000W
> amplifier as well. You are not going to be able to
> power your SSTC directly with it. You'll need a
> separate switching circuit to power your Tesla coil, which
> is typically a half or full bridge (for low frequency), or a
> class-e for high frequency operation.
>
> I definitely applaud your enthusiasm, but i would suggest
> you start small and probably pursue the class-e path.
> For high power, class-D is also a great alternative.
> Class-H is a better alternative to AB as it will be more
> efficient as well, especially with those power levels.
> If you're already designing a 1000W AB amplifier, then you
> obviously have a lot of electronic design experience so
> going to a Class-H amplifier with modulated power rails
> won't be much more of a leap for you.
>
> If you want to hear a 1kW system, my Plasmasonic II running
> here is running at 1.5kW.
>
> http://www.youtube.com/watch?v=6tKo_3DzdSU
>
> Dan
>
>
>
>
>
> That kit is nice and cute, unfortunately, it's not capable
> of pumping the amount of power I'm looking for. I
> would like the experience of constructing my own coil.
> The biggest problem I have at the moment is "How do i take
> an already great SSTC design and make it sing?" There
> are so many refined SSTC schematics out there fully capable
> of 500 watt plus power levels. However, I am not sure
> how one would go about turning any of them into audio
> modulated systems.
>
> This is my idea so far:
> Design a 300V Hexfet class AB amplifier using 1000 watts of
> power mosfets. Take the signal from my mixer, send it
> through a 1:1 audio isolation transformer, and ground one
> leg of the transformer on the output side so I have only a
> positive biased waveform. I can use that waveform to
> feed a low distortion MOSFET drive chip.
>
> Lastly, I will take my now audio modulated 1000W 300V
> signal and power my SSTC directly with it. Resulting
> in a crisp AM discharge with a class AB quality.
>
> Dose anyone see a problem with this design?
>
>
>
> --- On Mon, 2/15/10, McCauley, Daniel H <daniel.h.mccauley@xxxxxxxx>
> wrote:
>
> > From: McCauley, Daniel H <daniel.h.mccauley@xxxxxxxx>
> > Subject: RE: [TCML] Musical Tesla Coils (plasma
> speakers on steroids)
> > To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
> > Date: Monday, February 15, 2010, 7:45 AM John,
> >
> > I offer Class-E audio modulated kits that include
> basically everything
> > you need including PCB board, schematics, components,
> coil forms, and
> > detailed instruction guide.
> >
> > You can view the Class-E Audio Coil Instruction Guide
> > here:
> > http://www.easternvoltageresearch.com/designfiles/class_e_instructions
> > _rev2a.pdf
> > (PDF)
> >
> > And additional information on the design can be found
> > here:
> > http://www.easternvoltageresearch.com
> >
> > This design is very reliable and produces high quality
> audio.
> >
> > Dan
> > DRSSTC Kits, DRSSTC Books, Audio Modulated SSTCs, and
> more . . .
> > http://www.easternvoltageresearch.com
> >
> >
> > Hello all,
> > Are plasma Speakers similar to Musical Tesla coils. I
> have been trying
> > to find some decent plans for a plasma speaker for a
> while (with no
> > luck).
> > If plasma speakers are infact very similar to The
> musical tesla coil,
> > i would not mind makeing a very small musical coil.
> >
> > So anyway, if anyone has some easy plans for a plasma
> speaker or a
> > very small musical tesla coil that would be a huge
> help to me.
> >
> > Thanks,
> > John "Jay" Howson IV
> >
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
>
>
>
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