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lingDAC - cost effective RBCD multibit DAC design
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Old 29th March 2020, 06:57 AM   #731
abraxalito is offline abraxalito  United Kingdom
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At the start of my DAC journey I really didn't have any reference other than comparing a modded board to the original. I did find mods made a surprising amount of difference, mainly because the layout initially was so bad (the designer had ignored DS recommendations). I played around a lot with opamp I/V stages and filtering but eventually migrated to playing with TDA1543s which initially sounded rather dull to me in comparison. Is that what you meant by 'lacked detail' ?
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Old 29th March 2020, 07:55 PM   #732
Bartb is offline Bartb  Slovenia
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lingDAC - cost effective RBCD multibit DAC design
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Originally Posted by abraxalito View Post
You'll then need at the very least a headphone amp to create the simplest system - I am working on a design for that or you could use the SEbuff from lingDAC which is earlier in the thread.

Hello Richard,
(with reference to the above quote from post #709), would the SEbuff require modifictions in this case?

And if one's system comprises a preamplifier + amplifier, is the SEbuff still necessary to interface the PhiDAC/LingDAC (to the system)?
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Old 29th March 2020, 09:08 PM   #733
GORDMUS68 is online now GORDMUS68  South Africa
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Hello abraxilito,

I recall the lingdac v2 design had space for non fit capacitors with regard to compensating variation of inductors and their effects to frequency response. The difficulty to non technical eventually led to the abandonment of the lingdac, however those with understanding can still progress.

The lack of base had also arisen from some in the lingdac, although I canít say that I found/find that (simple battery power). The power supply improvement from subsequent development has led to better low frequency.

Is there any way to make improvements to the existing lingdac power supply? Or is it best just to move along with the new progress?
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Old Yesterday, 02:02 AM   #734
abraxalito is offline abraxalito  United Kingdom
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Originally Posted by Bartb View Post
(with reference to the above quote from post #709), would the SEbuff require modifictions in this case?
No mods required to the SEbuff but it runs at 7V so will need a regulator to reduce the 12V supplied to the DAC. Alternatively if the headphones being driven were higher impedance ones (say HD650 300R) then the SEbuff could be driven direct from 12V and the bias current reduced to maintain the same dissipation in the FETs.

Quote:
And if one's system comprises a preamplifier + amplifier, is the SEbuff still necessary to interface the PhiDAC/LingDAC (to the system)?
No need for SEbuff if the load to be driven is a normal line-level one (above 5k say). The buffer's only needed to drive headphones i.e. high current loads.
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Old Yesterday, 02:16 AM   #735
abraxalito is offline abraxalito  United Kingdom
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The lack of base had also arisen from some in the lingdac, although I canít say that I found/find that (simple battery power). The power supply improvement from subsequent development has led to better low frequency.
Running on batteries - low impedance LiFePO4 would be ideal - wasn't the configuration when I remarked on the bass weakness of lingDAC. Rather I was running with the stock PSU board which has a few switched-cap voltage doublers and discrete series regs. Adding extra caps on the supply to the filter-I/V board improved matters in the bass with that set-up.

Quote:
Is there any way to make improvements to the existing lingdac power supply? Or is it best just to move along with the new progress?
Run the filter-I/V board on the lowest impedance supply you can get, either with low ESR batteries or lots and lots of caps. I think I ran with over 100,000uF in my improved set-up - I discovered that my substantial supply of Panasonic 15,000uF 6.3V caps still worked fine at 9V
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Old Yesterday, 03:38 AM   #736
Luke is offline Luke  New Zealand
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Quote:
Originally Posted by abraxalito View Post
At the start of my DAC journey I really didn't have any reference other than comparing a modded board to the original. I did find mods made a surprising amount of difference, mainly because the layout initially was so bad (the designer had ignored DS recommendations). I played around a lot with opamp I/V stages and filtering but eventually migrated to playing with TDA1543s which initially sounded rather dull to me in comparison. Is that what you meant by 'lacked detail' ?
Yes dull is a fair comparison to make against the AD1955.
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Old Yesterday, 04:05 AM   #737
abraxalito is offline abraxalito  United Kingdom
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I eventually discovered that relative 'dullness' was more true to the source than the 'detail' which I had become accustomed to in AD1955. That finding was made when I started playing with low-pass filtering on the output of a DAC - by increasing the number of ferrite beads I used between DAC and I/V stage I was able to reduce the amount of 'detail' I got. Now I see 'detail' as an artifact which indicates something wrong in the DAC.

Of course some of the 'dullness' comes as a result of NOS droop so that needs fixing up.
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Old Yesterday, 07:55 AM   #738
Luke is offline Luke  New Zealand
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that's an interesting observation regarding detail being filtered out. I have a buffalo dac and a TDA1541 OS dac (pedja) and they both sound better to me. than tda1543 or AD1955, my biggest problem is my speakers are not good as the rest of my audio (kef Q900). I want to upgrade them at some stage, but they aren't too bad either.
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Old Yesterday, 12:30 PM   #739
GORDMUS68 is online now GORDMUS68  South Africa
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Much Appreciated - noted
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Old Yesterday, 06:26 PM   #740
Bartb is offline Bartb  Slovenia
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lingDAC - cost effective RBCD multibit DAC design
Quote:
Originally Posted by abraxalito View Post
No mods required to the SEbuff but it runs at 7V so will need a regulator to reduce the 12V supplied to the DAC. Alternatively if the headphones being driven were higher impedance ones (say HD650 300R) then the SEbuff could be driven direct from 12V and the bias current reduced to maintain the same dissipation in the FETs.



No need for SEbuff if the load to be driven is a normal line-level one (above 5k say). The buffer's only needed to drive headphones i.e. high current loads.

Ok thanks !
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