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Plasma Speaker, Halloween Project

Discussion in 'High Voltage' started by killivolt, Sep 2, 2013.

  1. killivolt

    killivolt Well-Known Member

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    Plasma Speaker.jpg

    I found this and I'm getting the parts together. I already had a Flyback.

    However, I want to incorporate another circuit I found as well.

    lightningfinal3b.gif

    In the end I will have sound produced by the plasma speaker, I'll pick that audio up with a Mic raise it 50db and send it to amplifier and pick it up at the speaker to run the lights.

    Later I want to build a Tesla singing coil with the same idea, and send video images of just the arc from the coil with a short throw projector.

    This is a better schematic...
    [​IMG]
     
    Last edited: Sep 7, 2013
  2. audioguru

    audioguru Well-Known Member Most Helpful Member

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    An amplified mic in the same room as its speaker will howl or squeal very loudly with feedback.
     
  3. killivolt

    killivolt Well-Known Member

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    The speakers will be outside, but I don't know what the HV will do to the Mic?


    Thank you.

    kv
     
    Last edited: Sep 2, 2013
  4. dave

    Dave New Member

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  5. audioguru

    audioguru Well-Known Member Most Helpful Member

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    I do not think an incandescent light bulb will light properly by the high audio frequencies from a plasma tweeter.
    It would light better by the boom-boom sounds from a woofer.
     
  6. killivolt

    killivolt Well-Known Member

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    Your right, I won't be able to get the low rumbles of thunder. I'm just going to have to go with a reproduction sound of lightening and thunder and add a subwoofer to the speaker.

    I'll still build the Plasma Speaker. If I ever build the Tesla Coil, I can show the image of the flashes off the coil as my lightening.

    Thanks, guru.

    kv
     
    Last edited: Sep 7, 2013
  7. audioguru

    audioguru Well-Known Member Most Helpful Member

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    HV is dangerous.
    Your plasma arc might set the kids costumes or their hair on fire.:(
     
  8. killivolt

    killivolt Well-Known Member

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    I'm going to just build it for the experience. No one will be near it.

    I'm removing it from the above project, as you said, I can't get the boom boom without a sub-woofer. The Plasma Speaker just will not do.

    As for my Tesla Coil, in the future, I will use a Camera to Pic up the Flash inside my Garage away from everyone, behind a locked door and send that image to a projector. All the HV will be in my Garage, only the projector and Speakers will be outside on my porch.

    Thanks again, guru.
     
    Last edited: Sep 7, 2013
  9. audioguru

    audioguru Well-Known Member Most Helpful Member

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    Make the video in 3D if you can to add to the scare.
     
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  10. wizard

    wizard Member

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    Hi KV,

    I made a Plasma Speaker 3 years ago.
    I used a flyback with a built-in tripler (almost all of the modern flybacks have one)and a very simple PWM circuit based on TL494.
    I never used a mike for it, Just a UM66 melody player circuit for start and later a MP3 playe. It worked just fine in both situations, Specially for in higher frequencies of audio. You must play and adjust the higher frequency (the carrier) to get the best result with arc and of course with audio...

    good luck with your project, But please, please and please be careful with high voltage.

    P.S Please NEVER use the high voltage circuit near your PC or any electronics devices...
     
  11. killivolt

    killivolt Well-Known Member

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    Thank you, wizard.

    My first intention was to get the audio from the Plasma speaker via the Microphone into a mixer and output to a amplifier and off to the Speakers. The lower circuit runs off the speaker level, in turn drives the light.

    No, I won't get anyone near it. I will be very careful. It's all just to build a fun project.

    kv
     
  12. killivolt

    killivolt Well-Known Member

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    I built it, but I'm not getting the GDT to work. Maybe the FETs don't have enough voltage or current ?

    I'll post some images of my Oscope. I'm watching it go up and down, but I just think I'm seeing the music playing, it's like 1.25v up and down as little as 500mv. Once in a while it will blip 10v or 11v then right back down.

    Edit: Oh, and I'm just running it on 12v, I think I'll kick it up and see what happens.
     

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    Last edited: Sep 14, 2013
  13. killivolt

    killivolt Well-Known Member

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    Ok, I found out I have the pinouts wrong, I'm going to have to go back over the board again.
     
  14. killivolt

    killivolt Well-Known Member

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    Update, I'm now going to try a GDT center Tapped, I have moved things around on the board, I think I was dealing with more problems than parasitics, I have the GDT positioned to take advantage of the outputs A/B or Q1 and Q2, however you want to say it. This did not work, the SG3525 is current sensing.

    In addition I have moved the control chip closer to the Power MOS's, I read somewhere it's better to have them as close as possible to the control chip, probably doesn't matter when using GDT.

    Plus I'm using a breadboard with pads, instead of strip board. If this layout works I will create a board with this design.
     

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    Last edited: Feb 12, 2014
  15. killivolt

    killivolt Well-Known Member

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    Well this Plasma Speaker Schematic is turning out to be a bust. I don't think the Author knows it crap and the Instructables Website doesn't know it's crap.

    It maybe true, that's if people are willing to help me simulate it.
     
  16. ronsimpson

    ronsimpson Well-Known Member Most Helpful Member

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    If you want to find a IC that can make high voltage from the power line.
     

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  17. killivolt

    killivolt Well-Known Member

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    Pretty straight forward. But, that would make it hard for me to create a working Plasma Speaker, in fact I would have the same trouble with Radalco's. ZVS Driver circuit.

    It's still cool.

    Thanks, Ron.

    kv
     
  18. Dr_Doggy

    Dr_Doggy Well-Known Member

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    i made a zvs driver, all that talk about noise causing false triggers paranoid me , what did have me hung for a bit was that my mosfets need to be on isolated heat sinks, otherwise you get a bad sound "knocking", in the end 12 v 0.75- 1.5 amp was enough for my flyback , i never tried the audio portion of circuit. but zvs was way better thatn the 2n3055 driver.
     

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  19. killivolt

    killivolt Well-Known Member

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    I created a simulation in LT Spice of the above circuit it seems to be working, I will chop the heat sink and split them apart, thanks for the tip.

    kv
     
  20. purplespiral

    purplespiral New Member

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    hey killivolt how is going with your project at the moment ???
    im starting working on the same schematichs and im wondering if you had success with this project .
    thanks .
     
  21. killivolt

    killivolt Well-Known Member

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    I'm waiting to purchase a Power Supply on Friday. I will hook it up and let you know any Prelims on the Driver Circuit. Once I have been able to establish a good Driver; I'll hook-up the Mosfets and attach the Flyback. Maybe Monday I'll get back to you.
     
    Last edited: Jan 29, 2014

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