ClassD using LM311

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Has anyone make classD based on 2 diagrams on LM311' datasheet?
 

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It would be very nice to try it out. How much power we could get from this? I guess, not much. Maybe it is suitable for high-efficiency headphone amplifier? By the way, have never noticed that there were such schematics in the datasheet although I have used LM311 before. If I get some time I will build this circuit. Too bad I have no LMs in hand at the moment.
 
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