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发表于 2010-9-26 23:12:20
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the design is based on Walter Jung's composite amp: a voltage opamp driving a buffer with global feedback on the whole thing.
a few things to consider:
1) the design's input offset is not balanced. R2 is too big.
2) there should be a resistor on the output.
3) the design uses high speed opamps and then slow them down with capacitors in the feedback loop.
if you look at the history of the designs and what its designers champaigned for their earlier designs, you will see that they had talked about how great an improvement it was to load the opamp with a CCS (into class A operation) and how noticeable of an improvement that has been, and only to see their drop that "innovation" here and went back to a traditional design, :).
you can save your time / money / efforts: a tpa6120 or the good old ad815 (<$2 each, for two channels, good for 500ma per channel) will beat the design hands down. |
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