Seems like I fixed the noise problem, it was my little bear pre-amp causing the noise and low level. Using a streamer with variable output I got high volume without noise.
Thanks a lot for all the help.
Great going Yngvejos
Keep us posted with your listening tests.Hari
Seems like I fixed the noise problem, it was my little bear pre-amp causing the noise and low level. Using a streamer with variable output I got high volume without noise.
Thanks a lot for all the help.
Good to hear you're up and running. A good pre-amp might be a nice project for the near future.
Yes I think so. It still don't play at ear bleeding levels,but I guess that's because I'm playing on junk speakers inside a 50m2 garage.
Jwilhelm: I plan to use my lcduino with r2r attenuator and dcb1 buffer on this one but I sold my Nad M51 so I guess I have to build another preamp or dac. Any suggestions?
Jwilhelm: I plan to use my lcduino with r2r attenuator and dcb1 buffer on this one but I sold my Nad M51 so I guess I have to build another preamp or dac. Any suggestions?
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You need around 2.5V input or more to drive the amp to full output. There aren't many sources that will put this out without a good pre-amp. Another thing to remember is clear undistorted sound is usually louder than it seems. It may be a lot louder than you realize. Your neighbors a couple blocks away might have noticed.
Ostripper has designed a nice linestage that would go good on the output of your d1 board.
http://www.diyaudio.com/forums/analog-line-level/272915-pitchfork-pre-amplifier-13.html#post4306134
http://www.diyaudio.com/forums/analog-line-level/272915-pitchfork-pre-amplifier-13.html#post4306134
Wow , somebody actually clipped !
I see there is discussion about servo values. I have standardized with
a simple combo of 1 meg/1uF for all my servo'ed IPS's.
As I mentioned before , 5.6K for the spook/symasui servo outputs.
(470R for ND/C servo's)
BTW , I am "fully back". No longer have to worry about ISP's being
in a city with 100mb service dripping from the trees.
OS
I see there is discussion about servo values. I have standardized with
a simple combo of 1 meg/1uF for all my servo'ed IPS's.
As I mentioned before , 5.6K for the spook/symasui servo outputs.
(470R for ND/C servo's)
BTW , I am "fully back". No longer have to worry about ISP's being
in a city with 100mb service dripping from the trees.
OS
What boards ?
The big OPS boards have one small over sight , the interface euro's are 4.87mm spacing instead of 5.03mm. Not a big issue , but this should still be fixed.
I'm thinking of condensing these slewmaster designs.
It is a real draw between the symasui/spooky/kypton ND designs. These 3
are electrically and sonically the best of any designs I have ever built
from this forum.
Symasui and ND are good candidates for a "Badger" type integrated PCB.
To Combine the Badger layout (3 pairs) with alternating P/N outputs to
have full rail cancellation at the output stage would make for one of
the most perfect AB amps ever.
I have a pair of ND's and a pair of symasui's in use now , I can't see how
any of the more complicated designs bring anything more to the table.
If you can't hear or can barely measure the noise floor .... and know
the design is <20ppm or better , what's the point ?
I'm not saying it is pointless to explore all these topologies , quite the
learning experience.
It does seem the most simple of them (symasui/ND) are the best all
around performers and deserve the spotlight (integrated boards).
OS
You prefer the ND to your Spookys then?
I've been really considering integrated designs too. These amps are too long for a chassis. A three pair Badger design with MT-200s was what I was thinking as well, but I was thinking of designing it so board mounted flat on the heat sink so the outputs would need to mount low.