hi kp, hi kevin
i only managed to try this tweak today. yeah! only today!
i discovered this mistake when i was building more dacs on sunday but it was too late to mod hence i posted on the forum.
i knew there would be an improvement but i'm still stumped by the quantum leap in performance!
i think it's louder than monica3. beyonce rarely goes positive db (with gain) compared to before.
boy, she's a completely different animal now. one of these days i'll try without beyonce. one less stage...
if you are keen, there is still something you could try but i'm not sure whether this tweak will improve sonics.
the board is laid out for 24 bits, hence 24 r2r resistors. however, i assembled only 20 thus making it 20 bits. it's more than enough for our systems.
most of the time, we can't even hear below 15 bits. yup, bits 15-20 most likely is as good as zero volts.
you could see i have a jumper which shorts bits 24-21. you could extend this jumper for 4 more resistors, thereby reducing the number of bits from 20 to 16 bits.
why do this? well, the ground connection is better. instead of going through so many resistors, the ground connection is better served by a hard solid wire.
anyway, this is what i think. it may not make any difference. even if there is any difference, i expect it to be minimal.
but then, i was still floored by what happened today!