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benproiii 5th July 2011 02:01 AM

Need help with Analogmetric TDA1541 DAC
 
1 Attachment(s)
I Bought the AnalogMetric TDA1541 Board and i have the CS8412, TDA1541 for an old CD Player.

Does removing the SA7220, 7HC4040 and Clock make the sound any better, does it add extra noise?

How exactly do you remove those so it has no-oversampling or no-reclocking?

I don't want to use opamps in the signal path, i would like to use a tube filter i have 2 6n2p/12ax7's does anybody no the best circuit for this task?

in the datasheet for the cs8412 it says that pin 20 goes to 1K, 0.047uF cap to ground on the board it is not connected, is that ok?

My input to the DAC is the SP/DIF on my Mac Pro / Coax on back of TV
The output of the TDA1541 goes through the tube filter through 10K volume pot and connects directly to the DX Precision I Power Amp.

gaetan8888 5th July 2011 06:10 AM

Hello

There is few errors in the Analogmetric TDA1541 DAC schematic.

Look at posts number 89-91-92-93-94 of this thread, there is answers and explanations about those errors:

http://www.diyaudio.com/forums/digit...da1541a-9.html

http://www.diyaudio.com/forums/digit...a1541a-10.html

Bye

Gaetan

batteryman 5th July 2011 10:42 AM

Quote:

Originally Posted by benproiii (Post 2628728)
I Bought the AnalogMetric TDA1541 Board and i have the CS8412, TDA1541 for an old CD Player.

Does removing the SA7220, 7HC4040 and Clock make the sound any better, does it add extra noise?

How exactly do you remove those so it has no-oversampling or no-reclocking?

I don't want to use opamps in the signal path, i would like to use a tube filter i have 2 6n2p/12ax7's does anybody no the best circuit for this task?

in the datasheet for the cs8412 it says that pin 20 goes to 1K, 0.047uF cap to ground on the board it is not connected, is that ok?

My input to the DAC is the SP/DIF on my Mac Pro / Coax on back of TV
The output of the TDA1541 goes through the tube filter through 10K volume pot and connects directly to the DX Precision I Power Amp.

To bypass the 7220, you need to remove it and then feed the data from pin 26 of the 8412 into pin 3 of the 1541,
connect pin 12 (8412) to 4 of 1541
connect pin 11 (8412) to 2 of 1541

You can leave out the 4040 and xtal as well. The 8412 is configured for I2S out so no need to alter any other pins.

I am using a pair of Sowter transformers to perform I/V conversion and as my JLH power amp has an input impedance of 47k, connecting the transformer secondary direct to it. I might try a valve preamp in between as well.

Try http://lampizator.eu for his valve preamp.

batteryman 5th July 2011 12:39 PM

Quote:

Originally Posted by batteryman (Post 2629031)
To bypass the 7220, you need to remove it and then feed the data from pin 26 of the 8412 into pin 3 of the 1541,
connect pin 12 (8412) to 4 of 1541
connect pin 11 (8412) to 2 of 1541

You can leave out the 4040 and xtal as well. The 8412 is configured for I2S out so no need to alter any other pins.

I am using a pair of Sowter transformers to perform I/V conversion and as my JLH power amp has an input impedance of 47k, connecting the transformer secondary direct to it. I might try a valve preamp in between as well.

Try Lukasz Fikus Lampizator for his valve preamp.

Didn't spot that M0 on pin 23 of the 8412 needs to be connected to 0v not +5v as shown, (grounding pin 23 switches FCK to output to drive the L/R switch (BCK) input in the 1541)

So to sum up:
8412 1541
Pin 23 to 0v instead of 5v
pin 26 to 3
pin 12 to 4
pin 11 to 2

omit 7220 4040 and xtal.

benproiii 5th July 2011 02:45 PM

Don't you mean connect pin 11 (8412) to pin 1 (1541)
thats how it was done in the other NOS circuits

benproiii 5th July 2011 02:51 PM

1 Attachment(s)
like this (i added subwoofer output)

batteryman 5th July 2011 03:27 PM

Quote:

Originally Posted by benproiii (Post 2629224)
Don't you mean connect pin 11 (8412) to pin 1 (1541)
thats how it was done in the other NOS circuits

Yes, you are right, brain's not working well today.

Pin 11 (8412) to 1 of 1541
pin 12 to pins 2 and 4 of 1541
pin 26 to pin 3 of 1541

pin 23 to 0v

I

benproiii 5th July 2011 08:26 PM

Would a output stage using the OPA633 have better sound than a tube output stage

benproiii 5th July 2011 08:51 PM

What are the benefits of NOS the 1541 (Is there going to be excessive noise?)

batteryman 5th July 2011 10:15 PM

Quote:

Originally Posted by benproiii (Post 2629596)
What are the benefits of NOS the 1541 (Is there going to be excessive noise?)

I'll be finding out for myself in a week or so.
I am building a dual differential 1541a dac with transformer I/V conversion and valve output stage. I will no doubt need to experiment with addtional filtering if the nos Audio Note Dac1 kit I had was anything to go by.

SOWTER AUDIO TRANSFORMERS

As for opamp versus valve - you should compare yourself - its personal preference for the sound.
With opamps, filters are easier to implement so I would leave them connected on your dac and just try nos to see if you like the sound.
Then fit transformers between dac and opamp stage and listen again. Then finally try the valve stage.


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