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Building the ultimate NOS DAC using TDA1541A
Building the ultimate NOS DAC using TDA1541A
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Old 15th September 2013, 03:53 PM   #4941
maxlorenz is offline maxlorenz  Chile
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I use proper copper rods on my dedicated circuits (though one has cable TV and web connection) and balanced power transformer, which is not exactly isolation transformer.
I like balanced power

Cheers,
M.
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Old 15th September 2013, 06:53 PM   #4942
PreSapian is offline PreSapian
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hi ecdesigns,

could you tell me how i would be able to float pin 7 of 1543 if i was using active i/v stage such as zen or ad844?

and is there any other trick that can be performed for the pair of 1543 in balanced config with flipflopped data?

thank you.

i've been toying with 1543 since the beginning of this year and your pin float mod still stands as the most dramatic improvement to the chip, yet. i also was regarding your i2s signal attenuation circuit with diode strings but found out that it was reducing the gain in a balanced config where the data signal is fed through 74hc04 hex inverter.

when i disconnect the diode string the gain would go up.
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Old 16th September 2013, 12:03 AM   #4943
jstang is offline jstang  United States
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Could you drive a copper rod into your soil ? Mine would look like a pretzel....I need the copper clad steel.

These grounds improved the TV cable reception....



Quote:
Originally Posted by maxlorenz View Post
I use proper copper rods on my dedicated circuits (though one has cable TV and web connection) and balanced power transformer, which is not exactly isolation transformer.
I like balanced power

Cheers,
M.
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Old 16th September 2013, 11:49 AM   #4944
Bernhard is offline Bernhard  Germany
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Quote:
Originally Posted by maxlorenz View Post
And the winner DAC chip is...???
Let me make a guess: PCM56
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Old 16th September 2013, 02:43 PM   #4945
triode_al is offline triode_al  Netherlands
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Quote:
Originally Posted by Bernhard View Post
Let me make a guess: PCM56
It can't be connected to I2S, can it?
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Old 16th September 2013, 09:37 PM   #4946
Bernhard is offline Bernhard  Germany
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Originally Posted by triode_al View Post
It can't be connected to I2S, can it?
Use I2S for what ?
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Old 17th September 2013, 07:36 AM   #4947
SSerg is offline SSerg  Russian Federation
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Hi, Shinja

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Originally Posted by Shinja View Post
This tweak may make worse chip to be better performance, or typical chip to catch S2 spec, I expect.
Interestingly, you yourself have used this method? Can you tell me what are the results?

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Originally Posted by Shinja View Post
This tweak is unsuitable for passive IV circuit.
This is not entirely true. You can create a constant bias voltage across the I/U resistor.
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Old 24th September 2013, 04:56 AM   #4948
Alexandre is offline Alexandre
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Quote:
Originally Posted by maxlorenz View Post
I use proper copper rods on my dedicated circuits (though one has cable TV and web connection) and balanced power transformer, which is not exactly isolation transformer.
I like balanced power

Cheers,
M.
Hi,

Whats the difference between that and a iso transformer?

I use a EMI common mode mains filter for my dac and it definitely makes a difference for the better. Itīs a delta electronics, sealed can, I took it from a no-break.
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Old 24th September 2013, 05:00 AM   #4949
Alexandre is offline Alexandre
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I have been browsing this thread, looking for ideas to improve my dac, and something struck me here: the dedication and diligence of John and how much he has given here.

John: Your work is much appreciated! This thread is invaluable for any serious diyer.



Best regards,
Alex

Last edited by Alexandre; 24th September 2013 at 05:08 AM.
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Old 24th September 2013, 12:22 PM   #4950
maxlorenz is offline maxlorenz  Chile
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Quote:
Originally Posted by Alexandre View Post
Hi,

Whats the difference between that and a iso transformer?

I use a EMI common mode mains filter for my dac and it definitely makes a difference for the better. Itīs a delta electronics, sealed can, I took it from a no-break.
Hi. These guys explain it better than I could:

Index of Technical Articles About Balanced Power

Quote:
John: Your work is much appreciated! This thread is invaluable for any serious diyer.
Yes, his approach is like analysing with a magnifying lens every step of the chain and he has shown that every single part of his low parts count DACs matters to audio...

Cheers,
M.
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