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Old 27th June 2008, 01:33 PM   #1
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Question Advice needed: Output stage in Sony TA-E9000ES (CXA8042AS DAC)

Got my hands on a Sony TA-E9000ES AV preamp and looked at the output stage schematics. As expected I found lots of NJM4580 opamps in it, not really the ones to go with. I have no idea of output filters and stages for DACs, so I ask for some advice: Change opamps (AD712 for AD8620 and NJM4580 for LM4562 or OPA3134?) or just leave it as it is?

Here is one of the CXA8042AS DACs:

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And here is the output stage (signal flow marked with red arraows):

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Thanks!
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Old 15th July 2008, 11:25 AM   #2
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Old 22nd June 2011, 03:20 AM   #3
treuben is offline treuben  Australia
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It's ages old, this thread, but that isn't a dac - it's a digital volume control. I'm guess - just guess mind - that the AD712 was a set up as a digital filter and then njm the o/p amp. If so the 712 is a fast settling amp designed for the purpose. Replacing the o/p amp might do something though. 8)
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