Originally Posted by ~n00beR
Nice layout luften
I've been working on something similar using the BUF634T as a preamp, i havent got round to making some boards up yet
, and was thinking of using a 3rd channel as a ground.
Anway back on topic, nice layout, well done
Thank you!
If someone is interested, I also have a couple of measurements performed with an AudioPrecision 2522. The load at measurement time is 300ohm, to show how they work with Sennheiser HD650.
Frequency Response
This is measured at two different levels, and as you can see, one channel is a little bit higher than the other, because of the Alps RK09 potentiometer.
At 20khz, the signal is at -0.3 dB.
THD + N and N
Here you can see that THD+N (yellow line) is lesser than 0.003% from 10hz - 20khz. The red line is only N, wich shows a little peak at 50hz.
THD vs Power in 300ohm
This shows that the THD+N is very low all the way until ~290mW where the clipping point seems to be.
Conclusions, it could be done better, but, this is good enough for me at this time!