Simple Class D Amplifier

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This is a circuit i came up with this morning, i have just finished building it and it turns out it works well above expectation.

I'm running it from 2x35VDC and the fets(IRFP450) is not even getting warm.

Schematic: http://i.imgur.com/giy22.png

Hi tekko, I would like to know how did you calculate the values of this circuit.
thanks in advance. ;)
my email is fabiantriguero@hotmail.es
 
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