Instructables

Singing Arc Plasma Speaker project - revision 2.0!

Picture of Singing Arc Plasma Speaker project - revision 2.0!
You've probably seen my last, failed singing arc project. I decided to give it a second attempt. Anyway, I believe I know what went wrong, which I covered in the last instructable.

So after realizing that driving an inductor or transformer in the flyback mode of operation will basicly lead to failure at higher powers, I decided it was time to change tactics. Instead of driving the flyback in it's flyback mode, I will drive it with resonance!


 
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Step 1: Disclaimer, and dangers.

If you have not messed around with high voltages before, Please don't attempt to make this circuit. The ZVS driver I am building is easily capable of delivering 45,000 volts (45 KV) @ 5-15 mA of current. This output current can cause serious problems such as loss of muscular control, involuntary spasms, heart fibrillation, cardiac arrest, death, and perhaps worst of all, involuntary self-urination. You definitely would not want any of that!


I've made a variety of different 555- and TL494-based plasma speakers, but I've never seen a ZVS version. Very cool!

Making sure I understand what's happening here: the output of a Class A audio amplifier is coupled into the plasma by audio-modulated the +12V input to the center-tapped flyback used in the ZVS; this is accomplished by winding a secondary coil on the 12V+ input inductor and feeding it with the audio amplifier output?

andiukas2235 months ago

Good luck,i am too trying to build this singing arc device.What do you think about the sound quality and loudness of these "speakers"?

-max- (author)  andiukas2235 months ago
It is not very loud. It is simply an ineffficent class A amplifier I made only since it was made of parts I had on hand. It simply modulates the 12V input. It is not very loud, and I half expected it to not work at all. The 555 modulated version is considerably louder, but less clear and of course like I said I could not get it to work well. Although it is quiet, it is clear when the right amount of bias is placed across the input. I do need to make a better solution, if I get my hands on a proper audio amp, I will utilize it instead. Another problem is the way I modulate the input, with the inductor of the positive rail, and feeding in a single though a second winding. That winding since it has a constant DC across it, and it gets very hot.