_halfbridge-plasma-speaker.jpg "Halfbridge plasma speaker from gdt Video Screenshot Preview")
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⏲ Duration: 1 min 42 sec
✓ Published: 24-Dec-2011
✓ Published: 24-Dec-2011
Description:
Halfbridge driving a line output transformer via SG3525 chip, audio signal is provided via mobile phone. It sounds much louder in real life.nnMOSFET's (IRFP260's) still get hot. GDT still needs some tweaking and possibly a npn-pnp transistor stage between the chip output and GDT.nnI used 50K potentiometer in place of the 10K, the higher range of resistance worked better for my flyback in that I could get a better sounding arc (less hissing).nnSorry about the noisy video, this was filmed in a roo
Halfbridge driving a line output transformer via SG3525 chip, audio signal is provided via mobile phone. It sounds much louder in real life.nnMOSFET's (IRFP260's) still get hot. GDT still needs some tweaking and possibly a npn-pnp transistor stage between the chip output and GDT.nnI used 50K potentiometer in place of the 10K, the higher range of resistance worked better for my flyback in that I could get a better sounding arc (less hissing).nnSorry about the noisy video, this was filmed in a roo
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