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-   -   Bi-Fillar solenoidal air core output coils for bridged class D amps? (http://www.diyaudio.com/forums/class-d/154236-bi-fillar-solenoidal-air-core-output-coils-bridged-class-d-amps.html)

sendler 31st October 2009 10:03 PM

Bi-Fillar solenoidal air core output coils for bridged class D amps?
 
For class D amps using a bridged/balanced output such as the Sure 2X100, would the switching wave be perfectly inverted when the audio output + and - legs are run in from opposite ends of a bi-fillar air core coil to become in phase so as not to cancel the audio. The switching wave would be highly attenuated right there, along with it's EMI , reducing the requirements of the filter drastically while also creating some inductance for the filter to work with to finish the job. Would it be too much power to magnetically "short" resulting in smoke in the coil or over loading the amp's outputs at a narrow Q of the switching frequency? If this would work, it could be the ideal way to implement a smaller value solenoidal air core, and eliminate it's inherent EMI at the switching frequency.
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http://firenzeaudio.50webs.com/tech_dual.htm
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I am using toroidal air core output coils now which sound way better than my T106-2 cores but this would be even easier and make a more compact coil with less wire length.


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