Introduction: Some of My Plasma Speakers

Plasma speaker using a flyback transformer. It uses an SG3525 chip to switch two MOSFET's in a half-bridge fashion.

You can make one using a simple 555 timer circuit here https://www.instructables.com/id/Audio-modulated-flyback-transformer-driver/

Comments

Alex1M6 (author)2012-04-24


daniel.stillmunks (author)2015-12-27

So they got the 'plasma frequency modulator & oscillator' working. BFD = it sounds worse than the transistor radios of the 1950's !! bad sound = no sale.

explodingsodium (author)2013-09-13

Nice Instructable! I have a question though. Does the power supply need to be at least 8 Amps? I also have an ATX power supply from a computer, and it has a nice 12v rail, but I don't know how many Amps it is. Do you know if it's too high or low?

ivver (author)2013-04-12

Ok.
Btw, did you try to make switch with opto-coupler? I was thinking, if put one opto coupler then you can remove MOSFET ( bypass heating losses). That would be cheaper and you could have bigger voltage in flyback cicruit. What do you think, is it possible to perform that ?

ivver (author)2013-04-11

then this scheme should not work (but it's working, some guy created plasma speaker by this scheme and it works fine: http://people.cornellcollege.edu/dsherman/plasma-speaker-circuit.pdf

there are many pins in the bottom of the flyback, maybe there are some windings which works with lower voltage..

Alex1M6 (author)ivver2013-04-11

It will still function but you will not get as large of an arc.

jatwood2 (author)2013-02-08

could you use a ignition coil as the transformer

Alex1M6 (author)jatwood22013-04-11

Yes but it would not sound very good since they work at frequency's of a few kHz (think of nails scratching a chalk board). MIDI and 8 bit chip tunes would song good though.

ivver (author)2013-04-11

great work, but I have one question: will be good the primary coil in flyback or it is necessary to have manualy wound wire?

Alex1M6 (author)ivver2013-04-11

Manually wind one, the internal one is designed to work with voltages of around 160vdc.

Alex1M6 (author)2012-02-05
adamdwaldrop (author)2011-11-18

What is the model number of this flyback you are using? thanks!

Alex1M6 (author)adamdwaldrop2011-11-18

The print on the small sticker on the flyback has worn off sorry so I am not sure.

But any flyback will work fine for this.

ajha2 (author)2011-10-14

where is the circuit???????????//

Alex1M6 (author)ajha22011-10-14

I forgot to add it, its there now.

Alex1M6 (author)2011-10-14

Here is the schematic.

Alex1M6 (author)2011-10-04


Plasma speaker
from Alex on Vimeo.

Much bigger arc.
ale624 (author)2011-09-16

this is soooo cool!

crapflinger (author)2011-09-16

i support your song choice 100% (both for greatness and apropos-ness)

robot797 (author)2011-09-16

wll wers the circut?

Alex1M6 (author)robot7972011-09-16

Coming soon ( :

About This Instructable

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Bio: Me on YouTube youtube.com/Alex1M6
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