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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
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Old 18th January 2019, 11:21 AM   #8091
soekris is offline soekris  Denmark
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Simulations:

Get LTSpice, get the opa365 model from TI, draw up schematics, and you can do whatever simulations your want. It is DIY after all....
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Old 18th January 2019, 11:27 AM   #8092
CeeVee is offline CeeVee  Portugal
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Hi

I seem to have damaged these caps ( numbered 1 and 2 ) in the Vref section , i want to make "official mod" and need to replace them.

Can anyone tell me the values please.
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Old 18th January 2019, 11:34 AM   #8093
zfe is offline zfe
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Originally Posted by hop.sing View Post
This thread is very much alive again, great. I am always a little bit sceptical concerning subjective listening impressions, because even the most sensitive ears are easily deceived. And all those night and day differences are easily claimed, but usually a controlled blind listening scenario puts things into perspective.
But anyway, I just put some extra capacity on a ref.4 board and there might be a smoother presentation, but as I said...
I think the ladder power supply seems pretty good these days, what worries me more is, that i hear a clear difference from either a toslink source or a raspberry i2s source. A battery powered amanero sounds different again. That should not be the case. There is a fifo and isolation. What could be going on there?
Isolation is galvanic isolation it e.g. breaks ground loops. However it can not block all noise as it can not "distinguish" between noise and the signal if they are both in the "pass trough frequency band".
 
Old 18th January 2019, 11:52 AM   #8094
analog_sa is offline analog_sa  Europe
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
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Originally Posted by hop.sing View Post
There is a fifo and isolation. What could be going on there?
You must be new to this

These differences are not eliminated by fifo or galvanic isolation. In any dac, not just in the DAM. Among the mountains of stuff that is heard but not fully understood. Blame science, not the DAM
 
Old 18th January 2019, 11:53 AM   #8095
soekris is offline soekris  Denmark
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
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Originally Posted by CeeVee View Post
Hi

I seem to have damaged these caps ( numbered 1 and 2 ) in the Vref section , i want to make "official mod" and need to replace them.

Can anyone tell me the values please.
1: capacitor in feed back, was first 330pF, later on changed to resistor.
2: power decoupling, 1uF 25V.
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Old 18th January 2019, 11:59 AM   #8096
analog_sa is offline analog_sa  Europe
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
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Originally Posted by zfe View Post
Isolation is galvanic isolation it e.g. breaks ground loops. However it can not block all noise as it can not "distinguish" between noise and the signal if they are both in the "pass trough frequency band".
Yes, it was never designed as a noise stopper. And it generates its own noise.

There is always Toslink and optical isolators for usb, some using glass fibre.

I wish all this stuff was a bit better understood but then it wouldn't be so much fun.
 
Old 18th January 2019, 12:05 PM   #8097
CeeVee is offline CeeVee  Portugal
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Quote:
Originally Posted by soekris View Post
1: capacitor in feed back, was first 330pF, later on changed to resistor.
2: power decoupling, 1uF 25V.
Thanks.
 
Old 18th January 2019, 01:01 PM   #8098
TNT is offline TNT  Sweden
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Originally Posted by analog_sa View Post
You must be new to this

These differences are not eliminated by fifo or galvanic isolation. In any dac, not just in the DAM. Among the mountains of stuff that is heard but not fully understood. Blame science, not the DAM
They should really and if not - there is something wrong with the implementation. It's therefore I would like to know how often there is a need for a frequency change.

But maybe you have a technical description to why they are not?

//
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Old 18th January 2019, 01:06 PM   #8099
TNT is offline TNT  Sweden
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I'll stick to that a DAM connected to Toslink is technically the best setup one can do. For me it also sound good. I brought my "mono-power-DAC"s using 5 meter toslink each to a friend that doubted "Toslink" but it played the **** (ok - shaijt) out of his Mark Levinson stuff he did not say anything negative which of course means he agreed

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Old 18th January 2019, 01:19 PM   #8100
hop.sing is offline hop.sing  Europe
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Toslink sounds kind of soft compared to a i2s connected raspberry. Battery fed amanero is closer to toslink, but sounds fresher in a, for my ears, positive way. Sounds like transient behavior to me, i have of course no idea what is closest to reality, but raspberry sounds somewhat wrong and tiring.
 

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