What you think about this I/V stage ?

[Bernhard]

Differential DAC with virtual ground passive I/V.

I tried this first with the 2k resistor and removed it later, gives higher output.
The transformer ratio is 1:1 and could be substituted with a good instrumentation amplifier.

Only one channel finished yet, tested in a Denon DCD1500II and sounds very good.

 

[leadbelly]

Why do it this way? You introduce a bit error by doing a simple inversion to get the "-" phase signal, yet you do not need a balanced I signal at all, the iron will do this phase splitting work for you. Right?

 

[guido]

Why not? Power supply noise is cancelled out this way (a guess. And only if both pcm's are on the same supply) and the transformer is a low pass filter on it's own (add a resistor without filter, see the other thread )

As for the lsb error, eh <censored>

 

[leadbelly]

Power supply noise is cancelled out this way

 

[guido]

I take that as a no. Wasn't shure (as i said) but why not?. The powersupply rejection is not that good (pos supply).

As for your explanation, very usefull!

 

[leadbelly]

As for your explanation, very usefull!

I didn't mean to offend, I find emoticons pretty tame myself.

 

[guido]

No offence, but i'm still interested in that explenation.

Did something similar myself with tda's. But with i/v resistors (two, one per output) to gnd, since the dac gives -2mA at zero.

The DC generated over the resisors is cancelled out when you hook up the transformer over both outputs.