For the sake of audio
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PostPosted: Wed Dec 06, 2017 6:16 pm 

Joined: Thu Dec 30, 2004 10:50 pm
Posts: 998
Location: Minnesota
I think T suggested something like this in a post a long time ago.

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PostPosted: Thu Dec 14, 2017 5:54 am 

Joined: Mon Nov 28, 2005 1:10 pm
Posts: 547
You would have to make everything dual mono and floating, can´t join the "grounds" again after you connected one DAC phase to the ground of the SE amp... So it´s diy only I suppose. Other than that I think it would work.

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PostPosted: Mon Dec 18, 2017 4:41 am 
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Joined: Thu Jul 26, 2007 5:45 pm
Posts: 1179

alexandre wrote:
Not a common base stage, but you could do something without a transformer: use resistor I/V to a reference voltage (battery + bypass) and use a tube or FET SE gain stage. One phase of DAC connects to ground of gain stage, the other to the input. Independent supplies are needed of course (galvanically isolated grounds). Just an idea. Sound any good?

Well, there are many ways. A common base stage is not so low impedance anyway, why not use a second common base stage to drive the base from the other phase.

Or (shock, horror from the technocrates) why not resistor I/U conversion to base from the inverted polarity signal and common base active conversion for the non-inverted polarity signal.

Or you could use a current conveyor and level shifter to have common base on both polarity signals.

I suspect using a "half diamond" to buffer the actual I/U converter/mixer base will be needed. Hard to get below 0.0X % THD using just single BJT's, but can be improved using a Sziklai pair.

Other options exist. Be creative.

Ciao T

"For a successful technology, reality must take precedence over public relations, for nature cannot be fooled." Richard Feynman

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