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Old 7th February 2008, 03:26 AM   #1
cuibono is offline cuibono  United States
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Default moding P Daniel's NOS DAC?

From a discussion over at, i was thinking about doing the following change to the Peter Daniel NOS DAC, in particular, adding an input transformer and balancing the signal.

What I plan to do is the right hand part of this schematic (right of 'cable'):
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Old 7th February 2008, 03:30 AM   #2
cuibono is offline cuibono  United States
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Here is the original circuit of the DAC:

Really, I hardly have an idea what I'm doing, so if there is a disaster eminent, please warn me. Otherwise, I'm going to try it out.

NB - I have already built the left hand side of the above circuit, and it is a definite improvement over the stock SPDIF output in my Delta 1010lt..

= lack of knowing better
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Old 7th February 2008, 03:53 AM   #3
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What kind of transformer is that S22083?

I tried few transformer types (Scientific Conversion, PE6251, Schott and some custom made unit from China) but none of them sounded good enough.

The circuit also sounded better with SN75179 buffer.

If you experiment with transformers, you may remove the buffer.
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
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