As I mentioned in the other thread http://www.groupdiy.com/index.php?topic=51698.0
please find attached the block dgm of the audio test interface I'm designing.
Obviously, in terms of performance, it cannot challenge an AP, but I think it is up to the task for many of us. It comes from my own experience, where I have an old 1970's oscillator, with those useful and ergonomic things called knobs, but it's not super-low distortion, about 0.1%; I also have a semi-automatic THD meter, not bad but has only unbalanced ins. A souncard is capable of generating super-low THD signals and making super-complex measurements, but lacks in the I/O department.
The unit should be a 1RU piece of about 6" depth, with all the connections on the front panel (except mains).
Please comment, suggest, embarass me, insult me, praise me...
Caveat#1: I know the CMR test is not fully compliant to the standard, but in practice, I don't think it makes much difference.
please find attached the block dgm of the audio test interface I'm designing.
Obviously, in terms of performance, it cannot challenge an AP, but I think it is up to the task for many of us. It comes from my own experience, where I have an old 1970's oscillator, with those useful and ergonomic things called knobs, but it's not super-low distortion, about 0.1%; I also have a semi-automatic THD meter, not bad but has only unbalanced ins. A souncard is capable of generating super-low THD signals and making super-complex measurements, but lacks in the I/O department.
The unit should be a 1RU piece of about 6" depth, with all the connections on the front panel (except mains).
Please comment, suggest, embarass me, insult me, praise me...
Caveat#1: I know the CMR test is not fully compliant to the standard, but in practice, I don't think it makes much difference.