Recomend passive I/V stage.
Mar 25, 2006 at 1:25 AM Thread Starter Post #1 of 1

Garbz

Headphoneus Supremus
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I've had my DAC fully working for about a month so it's time to start playing with it. I should really build the powersupply first but it's taking ages to get the parts. In the meantime I was thinking of playing with the output stage (currently and OPA627 + 2sc1815 follower), and I'm investigating a passive stage only.

Constraints:
- Balanced output. The PCM1730 provides this and I want to keep it.
- Must be referenced to Vcom (+2.5V) and not ground as this is the internal bias for the PCM1730.
- No transformers, or at least not yet rick
wink.gif
Atm I'm looking for a very low cost solution before I start playing with more serious stuff.
- Analog filter is not that critical, stopband attenuation on the DAC is pretty good and a 48khz or even higher filter would be sufficient.
- No eletrolytic caps!

Any ideas?
 

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