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Re: [TCML] RE: Sound Modulated tesla Coils




I always wondered if for SG coils a spark gap trigger could be implemented that used a moving coil kind of apparatus to modulate the sparks with sound. Of course, you'd have to be careful to make sure the trigger frequency didn't exceed safe limits...

Joe



On 10/22/2012 4:08 PM, Jim Lux wrote:
On 10/22/12 11:30 AM, Greg Cousen wrote:
Hi Mate,
Thank you for your reply, I have looked on the net but have not seen any
kits for the SSTCs, I have seen the rotary gap advertised as a kit, I will
keep on looking, here in Aust our voltage is 230 / 240 @50hz,
I will look into the variable frequency idea, thanks again :)



I'm philosophically a big fan of the DC coil with a triggered spark gap, but getting a decent DC supply in a small size is tricky (I have a 30kV 10kW supply, but I don't have three phase power at home to run it), and I've not gotten around to, say, putting three NSTs in combination with a small rotary phase converter.


If you do the rotary gap technique, you can change the speed of the rotor (using a motor speed control), but pitch changes will then all have a glissando effect.

If you do rotary gaps you could have multiple rotors, running at different rotation rates (say with a belt drive off your prime mover.. so you have one running at 1500 RPM, one running at 1000 RPM, etc. That would give you your octave scale. By changing how many electrodes are in use on a given rotor, you can get octaves (e.g. using 2 fixed electrodes vs 4). You can also change the number of electrodes on the rotor.

If you are mechanically inclined this might be a cool approach. You could have a keyboard (or footpedal board) that actuates switches to connect and disconnect the HV to the various rotary gaps. I've thought about using small air cylinders as actuators to move a fixed electrode towards and away from a rotor. You drive the cylinder through plastic air hoses, so the cylinder floats at the HV potential. it would be very steampunkish..



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