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Registered Member #3766
Joined: Sun Mar 20 2011, 05:39AM
Location:
Posts: 624
Hey, I've been thinking about building a setup of two standard plasma speaker arcs (stereo) and then a panel of spikes emitting corona.
My thinking is that since the corona is a lot more area of air that is being moved, it will be better at reproducing the lower frequencies, especially if I put it through a low-pass filter and skip the ultra-sonic base frequency and modulate the corona directly.
Since there will be so much corona (I'm thinking 100 spikes, 10X10), I figured I might have problems powering it all on one flyback, which means paralleling multiple (I see a lot of paralleling in my future). I hope this can be done without them killing each other (doubtful unless I find 10 identical ones) If not then I will parallel them signal-wise and have the outputs each power a separate row of spikes. Or one circle in a bunch of concentric circles of spikes, not sure which yet...
So, does anyone have any thoughts on this? Especially on the idea of it working better for lower frequencies bit and for the bit about powering the spikes? Please have thoughts...
[EDIT] If the design didn't make sense I'm currently sketching it up, I'm also downloading autodesk (free and legally!), and I will start using that for stuff soon If it ever downloads... 3.3 gig is taking awhile...
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
magnet18 wrote ...
Hey, I've been thinking about building a setup of two standard plasma speaker arcs (stereo) and then a panel of spikes emitting corona.
My thinking is that since the corona is a lot more area of air that is being moved, it will be better at reproducing the lower frequencies, especially if I put it through a low-pass filter and skip the ultra-sonic base frequency and modulate the corona directly.
Since there will be so much corona (I'm thinking 100 spikes, 10X10), I figured I might have problems powering it all on one flyback, which means paralleling multiple (I see a lot of paralleling in my future). I hope this can be done without them killing each other (doubtful unless I find 10 identical ones) If not then I will parallel them signal-wise and have the outputs each power a separate row of spikes. Or one circle in a bunch of concentric circles of spikes, not sure which yet...
So, does anyone have any thoughts on this? Especially on the idea of it working better for lower frequencies bit and for the bit about powering the spikes? Please have thoughts...
[EDIT] If the design didn't make sense I'm currently sketching it up, I'm also downloading autodesk (free and legally!), and I will start using that for stuff soon If it ever downloads... 3.3 gig is taking awhile...
It sounds like your going to suffocate on ozone. Corona produces a LOT of ozone so...be careful where you use this.
Registered Member #3781
Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
you should definitely build it even if it produces to much ozone. Just run it outside in the garage or something, let us know how it goes though! For powering all the seperate arcs or whatever, you could build several different drivers (each powering a flyback) and parallel them at the audio in, you may need to run the audio source through an amplifier to get it loud enough to hear though. You can worry about getting rid of ozone later
Registered Member #3429
Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288
Camp Badger wrote ...
you should definitely build it even if it produces to much ozone. Just run it outside in the garage or something, let us know how it goes though! For powering all the seperate arcs or whatever, you could build several different drivers (each powering a flyback) and parallel them at the audio in, you may need to run the audio source through an amplifier to get it loud enough to hear though. You can worry about getting rid of ozone later
How 'bout this for a weird idea: MULTIPLEX the arcs! Here's what I mean..... Let's say that you have an 8 by 8 matrix of plasma arcs, and you want to control them together so that they form one large flat plasma discharge. Well, you can build 64 tesla coils with drivers feeding all 64 discharge points, or (much better) you build only one tesla coil/driver which you feed into a hv switch that "raster scans" the 8X8 matrix. The vertical and horizontal scanning frequencies would have to be high enough so that the scanning is imperceivable by the human ear. And of course, the hv switching system would have to be mechanically and electrically noise-free. I don't know if this is practical or even possible, but it was a fun mind game thinking about it!
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I always fancied the idea of building a big moving message display on that principle. I think ignition coils, one per row/column, would be better than Tesla coils.
Registered Member #3766
Joined: Sun Mar 20 2011, 05:39AM
Location:
Posts: 624
I have no idea how one would go about multiplexing kilovolts ultrasonically, let alone without distortion and noise... It would need to be above 20khz, multiplied by each spike... that's quite some frequency...
Registered Member #3429
Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288
magnet18 wrote ...
I have no idea how one would go about multiplexing kilovolts ultrasonically, let alone without distortion and noise... It would need to be above 20khz, multiplied by each spike... that's quite some frequency...
Yes, it would be pretty difficult to do. I actually thought about a possible method which uses 64 shunt regulator tubes (used in older large-screen TV's). The 6BK4 is a high voltage triode that can operate at 30KV plate voltage, but can only handle about 1 or 2 mA at that voltage. My idea is to feed all 64 tubes in parallel (not sure if you should feed the hv into the cathode or the anode) and the opposite electrode (plate or cathode?) of each tube would feed a single arc point. Then you would need a digital sequencer that would turn each tube on, one at a time, in sequence to raster scan the matrix of arc points. This of course would have to be done at a very high frequency, probably in the MHz range. Therefore, the Tesla Coil hv oscillator would have to operate at some microwave frequency. Yeah, it's crazy, but it's only a thought experiment, and not at all practical. Anyone want to give it a try?
Registered Member #3766
Joined: Sun Mar 20 2011, 05:39AM
Location:
Posts: 624
If you supply the tubes I'll give it a try! (seriously, if a bunch of those show up at my doorstep, I will give it a try) But since these are only flybacks, it sounds like it's going to be a lot easier just to wind a couple windings and put them in parallel... 5-10 flybacks v.s. 64 tubes and a megahertz oscillator and the associated UF-circuitry... which is less work...
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Low frequency plasma speaker
