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.
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.
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?
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> 😀
As for the lsb error, eh <censored> 😀
leadbelly said:
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!
guido said:As for your explanation, very usefull!
I didn't mean to offend, I find emoticons pretty tame myself.
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.
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.
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