They are some safety features to prevent the spikes damaging the player, but they can fail. Sounds in my model are produced by electric arc which ionized the air and thus produce plasma. Every one of our speaker models features this exceptional tweeter, which is largely responsible for our excellent reputation among professional sound studios and. The bt portable speaker has a builtin flashlight, giving you a fun way to illuminate your space in the dark. With the lowest prices online, cheap shipping rates and local collection options, you can make an even bigger saving. This dazzling desktop speaker streams wireless music from your iphone, ipad, samsung galaxy or other android device, along with arcs of plasma electricity that move and dance to the rhythm. A picture of our working plasma speaker is shown below. A plasma arc loud speaker has a better frequency response far exceeding the material of speaker cones.
Supersonic sc1451bt bluetooth plasma portable speaker. The circuit is a switchmode power supply based on the popular tl494. To cut down on that heat i decided to use a half bridge switch to drive the flyback this time. I used a flyback with a builtin tripler almost all of the modern flybacks have oneand a very simple pwm circuit based on tl494. But you may have to act fast as this top plasma speaker is set to become one of the most soughtafter bestsellers in no time. Sep 09, 2010 the circuit is a switchmode power supply based on the popular tl494. Old men, people with heart problems, kids etc should stay away from them. Jun 09, 2014 beside the plasma driving amplifier and the transduction device, each speaker enclosure also houses a large bottle of compressed helium gas footnote 2, which is fed on demand to the plasma field when the speaker is operating. This dazzling desktop speaker streams wireless music from your iphone, ipad, samsung galaxy or other android device, along with arcs of. Here is a basic singing arc, based on this instructable. Ok, thats become a bit of a trope in our community, but there is quite a lot of truth behind it. The controller is a tl494 and the mosfet is a irfp460lc. A couple of years ago ive built a large tesla coil. When the system is off, the helium flow is automatically turned off.
Index termsplasma speaker, plasma arc, flyback transformer. Im redoing tobiass project from the forum, a plasma. Youtube video of a hobbiests plasma speaker shows there are still a few tinkerers out there thinking about something other than the ipod. I had made a plasma speaker once based on a instructable with a tl494 and a flyback transformer. A half bridge is a topology that uses two mosfets that flip flop, each taking a turn conducting current.
Sherman cornell co llege 4 design and evaluation of electronic circuit for plasma speaker proceedings of the world congress on engineering 20 vol ii, wce. Assembled high power music plasma speaker driver board tl494. The project i decided upon was based on an old article i read in popular electronics magazine about modulating a plasma to produce sound. Jul 08, 2008 homemade plasma speaker puts on a light show. The frequency limitation of a plasma speaker is due to the thermal mass of the gas that is being heated. It has bluetooth wireless capabilities for connecting to ipads, iphones, ipods, smartphones, android tablets, laptops, mp3 players and more. Tl494, ncv494 switchmode pulse width modulation control circuit. I recommend grabbing a dozen or more of these chips from your favorite supplier, as its also the chip used in my plasma speaker projects. The electrovoice plasma p2 is a new generation of hipower compact subwoofers. It is better to have someone close who knows well, how these things work. The system comes with a formfitting docking station designed for the ipod 3g, ipod 4g with click wheel, ipod color, ipod video, ipod nano 1g and 2g, and ipod mini, along with interchangeable plasma globes.
Hazard to electronics since the plasma speaker generates high voltages, there is a chance there will be high voltage spikes on the low voltage side of the device, which can get onto the audio line and damage or destroy the player. The arc plasma speaker by excelphysics kickstarter. High quality plasma tweeters are very ex pensive, rendering them unsuitable for use in an average household. Ic tl494 acts as the oscillator and the audio modulator. Plasma speaker, halloween project electronics forum. A class h amplifier requires no fans for quiet operation, low maintenance, and longterm reliability. There are three types of electrically sustained plasma speakers. When changing the duty cycle away from 50%, you get a dc voltage at the output. This is potentially dangerous and eats up a lot of energy. Designed for evs plasma p1 speakers, its an ideal system extension for plasma p1 powered speakers. Make a plasma arc music speaker electronic music make. The arc is nearly inert that is way it have quick reaction for change frequency. Anyway, the 3cm arc is generated by a tvflyback on a tl494 circuit.
Ok, thats become a bit of a trope in our community, but. Slvs074h january 1983revised march 2017 tl494 pulse. Every one of our speaker models features this exceptional tweeter, which is largely responsible for our excellent reputation among professional sound studios and highend audiophiles alike. A plasma speaker uses a highvoltagepulse generator to produce a rapidly occurring series of plasma arcs, through which an audio signal can be transduced from an electrical signal into an overpressure wave, capable of being heard by a human.
This is a heavy duty design of a pulse width modulator dcac inverter using the chip sg3524. This is one of the first runs of my plasma speaker, playing whatever what was on the radio at the moment. Abstract a plasma speaker is an audio playback mechanism that uses an arc between two electrodes as a sound source. The tl494 acts like an oscillator and a modulator, it generates a high frequency 5khz to 45khz to drive the flyback transformer to make high voltage arcs. My last plasma speaker, which used only one mosfet, got a bit too hot to run without a bucket of ice water nearby. All major credit cards are accepted through secure payment processor paypal. Plasma speakers or ionophones are a form of loudspeaker which varies air pressure via a highenergy electrical plasma instead of a solid diaphragm. Another key component to this project was the tl494 chip figure 4, which acts as an.
If you arent comfortable assembling the plasma speaker, find some help. Assembled high power music plasma speaker driver board. It uses a tl494 to switch a mosfet very rapidly, dumping current into the primary coil of a tv flyback. The tl494 signal generator encodes the input music signal into a pwm. Construction of fullbridge plasma speaker introduction similar to conventional loudspeakers which vary air pressure using a solid diaphragm, plasma speakers accomplish the same task using a high energy arc of plasma. Designed primarily for powersupply control, this device offers the flexibility to tailor the powersupply control circuitry to a specific application. Tl494 datasheet, tl494 pdf, tl494 data sheet, tl494 manual, tl494 pdf, tl494, datenblatt, electronics tl494, alldatasheet, free, datasheet, datasheets, data sheet. The intent for this project was to construct a plasma speaker. The first instance of a plasma arc speaker can be traced back to william duddell in 1899. As is evident from the circuit diagram, the audio input to the circuit is through the ic. Featuring our highestlevel speaker transducers and the latest ev amplifier technology and signal processing, plasma brings together uncompromised sonic.
Plasma tweeter from the german horn specialist acapella. Final circuit layout, with lt6992 in place of tl494. It worked just fine in both situations, specially for in higher frequencies of audio. Think how jealous youre friends will be when you tell them you got your plasma speaker on aliexpress. The plasma speaker is a speaker, which have electric arc instead of membrane. Connected to the output of an audio amplifier, plasma speakers vary the size of a plasma glow discharge, corona discharge or electric arc which then acts as a massless radiating element, creating the compression waves in air that listeners perceive. The tl494 device incorporates all the functions required in the construction of a pulsewidthmodulation pwm control circuit on a single chip. Duddell connected an ordinary carbon arc lamp to a tuned circuit made of a capacitor and inductor, and he discovered that he could generate tones that corresponded to the resonant frequency of the tuned circuit. A continuous plasma in the form of a discharge between two electrodes is modulated with an audio signal, and the resulting rapid changes in the. The value of a plasma speaker lies in the exceptionally low size and mass of the element producing the sound, meaning that while it. The plasma speaker works by using a changing generation of heat to modify the. Even if an adult is handling them, they need to be informed about what they are doing first. My project consisted of assembling a fullbridge mode plasma speaker, with the goal of getting it to reproduce the audio.
Ive been using it as a backup to power up all my house when outages occur since aprox. Excelphysics is raising funds for the arc plasma speaker on kickstarter. Buy sunnytech plasma loudspeaker classic tl494 audio arc speaker music player. Whats in the box speaker system, interchangeable globes, formfitting ipod stand, users manual. On top of being a power hog and posing an electrical hazard, plasma arc speakers also generate ozone.
Slvs074h january 1983revised march 2017 tl494 pulsewidth. A small manual or card detailing the function of the two adjustment screws. By varying the intensity of the arc, different pressure waves are created. Sep 22, 2011 this is one of the first runs of my plasma speaker, playing whatever what was on the radio at the moment. Beside the plasma driving amplifier and the transduction device, each speaker enclosure also houses a large bottle of compressed helium gas footnote 2, which is fed on demand to the plasma field when the speaker is operating. The plasma speaker all eletromagnetismo componentes. The air rapidly heats up when the spark is on, and it cools quickly when switched off. I never used a mike for it, just a um66 melody player circuit for start and later a mp3 playe. Plasma speaker 2 my last plasma speaker, which used only one mosfet, got a bit too hot to run without a bucket of ice water nearby. The audio is modulated through the chip by altering the deadtime. Furthermore to increase the volume of a plasma speaker the arc needs to be longer, requiring even higher voltages. The value of a plasma speaker lies in the exceptionally low size and mass of the. The proprietary corona plasma tweeter, available only from us, forms the centerpiece of our loudspeaker systems. Never leave one unattended and only use them for short periods of time ideally under 2 hours in wellventilated areas.
Since then i was curious about how to make it play music. This ability makes it better than comercial loudspeaker. The engineering fair at ucf was a popular way for all disciplines within the college of engineering to highlight their capabilities in the way of technology demonstrations, project competitions, etc. Plays music through an arc of electrical plasma, making it one of the coolest speakers you can get. A plasma speaker aka singing arc is a speaker that uses a plasma arc to produce sound. In this paper we discuss different types of plasma speakers, and pre sent the electronic design and testing of a low cost plasma.
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