Disclaimer: High voltages are dangerous don't do this if you don't know what you're doing.
We built a Plasma Sonic Speaker (Schematic from http://www.hvlabs.com/plasmasonic.html).
The quality of the sound is much greater than what you can hear in this video.
Supply voltage: 12V @ 10A (PC PSU)
Transformer: removed from an old CRT monitor
Spark gap: ~1 cm
Song: Always - Erasure
We hope to improve it with a better PSU and perhaps a better transformer.
Videoing by SirSubstance.
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