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Old 14th October 2016, 02:10 PM   #1
abraxalito is offline abraxalito  United Kingdom
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The link to the pics isn't working for me so I'm making an educated guess about your schematic.

Most likely your lack of bass texture is because the DAC's PSRR isn't up to snuff and a significant limitation on this is the TDA1543's internal bias current source, controlled by pin7. Switching this off completely and building an external current source pays dividends in terms of PSRR.

A second but more complex way to improve PSRR is by building an active I/V stage - most likely at present you'll be using passive I/V.
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Old 14th October 2016, 02:41 PM   #2
QSerraTico_Tico is offline QSerraTico_Tico  Europe
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DIYHiFi.org • View topic - Regulator
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Old 14th October 2016, 03:07 PM   #3
ebj29 is offline ebj29  United Kingdom
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Default PSRR

Thanks for the reply !
I modified the way the link is displayed on my post, but if that still doesn't work, here is a direct link to one of the overview images :
http://expo29.com/public/hifi/DAC_TDA1543/DSC_3094.JPG

I'll look into PSRR options for this... thanks !


Quote:
Originally Posted by abraxalito View Post
The link to the pics isn't working for me so I'm making an educated guess about your schematic.

Most likely your lack of bass texture is because the DAC's PSRR isn't up to snuff and a significant limitation on this is the TDA1543's internal bias current source, controlled by pin7. Switching this off completely and building an external current source pays dividends in terms of PSRR.

A second but more complex way to improve PSRR is by building an active I/V stage - most likely at present you'll be using passive I/V.
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Old 14th October 2016, 03:15 PM   #4
ebj29 is offline ebj29  United Kingdom
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Default lowsy PSRR

Aha ! This does look like what I need !
Thanks for the input !

From that link :
"With digital chips (like dacs) I have always got improvements using double regulation. These chips usually have lowsy PSRR.
As soon as you double-regulate you will listen to tighter bass and a more defined overall presentation. Lower jitter? I think so.
With op-amps I agree with you, I also don't like double regulation, it sounds bad."

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Last edited by ebj29; 14th October 2016 at 03:22 PM.
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Old 14th October 2016, 03:29 PM   #5
ebj29 is offline ebj29  United Kingdom
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Um, I don't know what happened, but it looks like my original post has disappeared !

Should I repost it? Or can a moderator help me to put it back?

I still have the original text in my WORD document, so all is not lost.
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Old 14th October 2016, 04:35 PM   #6
ebj29 is offline ebj29  United Kingdom
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Default Original post

Well, here is the original post :

******************************************

Hi all !

My query is in regards to a DIY DAC I purchased 6 years ago built by a gentlemen in the UK.

DIY DAC TDA1543 CS8412

The sound is excellent, great imaging and sweet sounding. No technical problems what so ever, such as hum, clicks, pops etc; very well behaved.

My problem is that it lacks textural detail, in pretty much the whole range, but especially the bass. And as I have a Velodyne sub, that really stands out, especially in comparison to my Sumo Theorem DAC.

The parts are all top notch, so I donít know what I could do to improve or fix this.

Can anyone give me some ideas as to what I might do?

Also, does anyone recognize the PCB or the project background? It would help a lot !

My experience is mostly in building amps and preamps, never done a DAC.
Iím fairly well equipped with Fluke 17B+ multimeter, Oscilloscope and frequency generator.

Thanks very much for any input.

EBJ
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Old 19th April 2019, 08:45 PM   #7
dreamth is online now dreamth  Romania
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Quote:
Originally Posted by QSerraTico_Tico View Post
this is just a derivate of Audio Note DAC 3...4:
Download the Audio Note DAC-4 manuals for free - Hifi Manuals
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