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#7111 |
diyAudio Member
Join Date: Nov 2012
Location: Toronto
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#7112 |
diyAudio Member
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I have extracted schematic for V4 output.
As far I can see it has asymmetric gain, 1,5 for positive raw and 1 for negative. While it is possible to drive a balanced line with an unbalanced signal, I suggest to change negative feedback resistor on inverted opamp to 1,86K. This will increase gain for negative rail to 1,5, therefore balanced signal will be symmetric. Regards, Tibi
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#7113 |
diyAudio Member
Join Date: Mar 2007
Location: Maribor
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Hi
it is not asymetric... gain on inverted input is different formula as noniverted ![]() Instead 619 (1,2pin) use bigger resistor in the same relation 1,24 kohm ( 6,7 PIN) on other output. But than your gain will be higher also on xlr output. For my taste opa1602 (opa1622) is tooo soft sounded opamp...Soekris is soft and relaxed from default. Therefore for more dynamic sound i will use another opamp. Or different output stage. If you need just rca than the job is easier. |
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#7114 | |
diyAudio Member
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Quote:
![]() Regards, Tibi
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#7115 | |
diyAudio Member
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Quote:
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Søren - www.soekris.dk |
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#7116 |
diyAudio Member
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Now make sense. Thank you, Soren !
Regards, Tibi
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#7117 |
diyAudio Member
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To conclude. This is V4 output.
![]() Regards, Tibi
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#7118 |
diyAudio Member
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It's asymmetric in an other sense then as the distorsion of the neg side is the result of 2 OP amps but the pos is only from one?
And some delay.... //
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More distortion to the people! Timing . . . . is paramount. |
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#7119 |
diyAudio Member
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We can arguably debate this in all ways possible.
I'm not interested in balanced output, so from my point of view, schematic has the advantage that inverted opamp can be used as buffer for a "heavier" load. ![]() Now back to mods. Regards, Tibi
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#7120 |
diyAudio Member
Join Date: Nov 2012
Location: Toronto
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Hi Soekris, I have dam1021 rev1, and I'm trying to do the 16 caps mod. Soekris DAC: Modding VRef | H i F i D U I N O I found those holes in the PCB are very tiny, and around half of those holes were covered by PCB paint I guess and can't even put a single copper thread through it. So, my question is, seems those holes are not connected to other parts, right? Can I expand those holes using a tiny drill bit? Thanks! |
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