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Old 15th July 2010, 11:37 AM   #11
Mooly is online now Mooly  United Kingdom
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Quote:
Originally Posted by qusp View Post
remember they also need to be bipolar input for your dac.

mooly, I recommended the BUF634 to lordearl, as I figured they were single channel opamps acting as unity gain buffers (the stock opamp is OPA134), but of course we didnt get good results as they are also taking a bipolar input
The BUF634 isn't an opamp as such and certainly can not replace the OPA134.
http://www.datasheetcatalog.org/data...wn/mXtxtvx.pdf

I'm using lordearls link above for the circuit post #13,
I just received my Wolfson 4.0 BIY DAC :)
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Old 15th July 2010, 11:44 AM   #12
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good timing, got some OPA604 from Farnell, playing as we speak - not really noticeable differences yet (didn't imagine there would be as the BB sound signature is widely the same across their opamps - but these are a cheap opamp, so what the hey!)

What about the LME49600 - would they work on some kind of adapter?
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Old 15th July 2010, 11:51 AM   #13
Mooly is online now Mooly  United Kingdom
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The 49600 won't work at all, it's just a buffer. The opamps in the DAC are used as more than just buffers, implementing a filter function with the associated components.
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Old 15th July 2010, 05:56 PM   #14
qusp is offline qusp  Australia
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Quote:
Originally Posted by Mooly View Post
The BUF634 isn't an opamp as such and certainly can not replace the OPA134.
http://www.datasheetcatalog.org/data...wn/mXtxtvx.pdf

I'm using lordearls link above for the circuit post #13,
I just received my Wolfson 4.0 BIY DAC :)
i know this, but I had made a wrong assumption that the OPA134 was being used as a buffer/line driver as it can often be found in this position (wasnt looking at the schematic). its at the output after what seemed to be the IV, but because if the 4 dac chips there is a separate summing stage I failed to think of
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