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Old 3rd July 2012, 10:34 PM   #461
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Well, the transformer sums up signals from both opamps, + and - signals. The immediate improvement in the sound is in the bass level and articulation - no more muddiness.
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Old 4th July 2012, 05:47 PM   #462
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Quote:
Originally Posted by ClefChef View Post
Removed C17 and C18 from digital inputs 1 and 2 (we absolutely don't need capacitance there)
removed C269 and C264, those are HF filtering caps - snip snip.
Why did you deem it necessary to remove these? Have you thought about what function they perform?

No offense, but it looks more like you've selected a few components randomly which won't stop it working for no reason.
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Old 4th July 2012, 06:16 PM   #463
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Quote:
Originally Posted by aptsys View Post
Why did you deem it necessary to remove these? Have you thought about what function they perform?

No offense, but it looks more like you've selected a few components randomly which won't stop it working for no reason.
No offence taken...I know exactly what function those caps perform, they should not be there.

Those caps on digital inputs were probably put to filter out HF noise. Problem is that they also add to cable capacitance that would cause an "overshoot" of square digital signal.
Those caps on analog outputs were put to filter out HF noise as well, that is already done by signal processing components up the signal chain.
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Old 4th July 2012, 07:09 PM   #464
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...my mistake, caps on digital inputs add to cable capacitance and cause signal not to "overshoot" but to become "saw-tooth".
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Old 4th July 2012, 09:05 PM   #465
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Quote:
Originally Posted by aptsys View Post
Why did you deem it necessary to remove these? Have you thought about what function they perform?
Take a look at the picture. They are screwing up the signal.
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File Type: jpg DM100pf_2.jpg (77.8 KB, 261 views)
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Old 5th July 2012, 09:08 AM   #466
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Originally Posted by stormsonic View Post
Take a look at the picture. They are screwing up the signal.
Interesting - is that the digital input? Do you have the before and afters? They shouldn't really be affecting the signal like that as the -3dB point is way above any SPDIF frequency, and more intended for radio and mobile phone interference suppression.

Last edited by aptsys; 5th July 2012 at 09:12 AM.
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Old 5th July 2012, 10:57 AM   #467
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yes, digital input with 100pF cap to ground. And bellow is picture with 100pF cap removed.
Stop thinking in "audio analog signal", flip switch to "RF signal integrity mode"
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File Type: jpg tdr_signal.jpg (28.8 KB, 221 views)
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Old 5th July 2012, 11:55 AM   #468
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Where did you have the scope probe? At the input to the mux, and was the mux set to that input?
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Old 5th July 2012, 12:12 PM   #469
marce is offline marce  United Kingdom
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Digital signal integrity
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Old 5th July 2012, 05:24 PM   #470
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yes, it should be: Digital signal integrity.
But there is clock embedded into signal and must be extrapolated, therefore I intentionally wrote down "RF signal integrity"
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