I don't feel like giving the chinese more money, can I pull the pcb out of my cd-65? - Page 3 - diyAudio
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Old 26th December 2012, 06:25 AM   #21
freax is offline freax  Australia
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I got a sound coming out of the TDA1541 however it was extremely distorted, as Qusp said would happen on page 1.

I'm going to cut the trace going to pin 4 anyway and see what happens.
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Last edited by freax; 26th December 2012 at 06:52 AM.
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Old 26th December 2012, 06:40 AM   #22
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by freax View Post
I'm going to cut the trace going to pin 4 anyway and see what happens.
Absolutley, all 3 traces must be cut on the Philips board. Pin 1, 2, and 3. Cut 4 as well just in case, but i doubt it was in use, most likely was tired to GND. No reason why it shouldn't work. What is BCK running at; 2.8224Mhz? Are you over sampling? If so it may be 5.6448Mhz.
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Old 26th December 2012, 06:44 AM   #23
freax is offline freax  Australia
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Ok we can conclude from that:
The TDA1541 requires an input on both pin 2 and pin 4 because I cut that trace and it left me with no output.

And that:
Simply Feeding the TDA1541 a raw I2S signal gives nothing but digital noise out on the other end.
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Old 26th December 2012, 06:47 AM   #24
freax is offline freax  Australia
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Quote:
Originally Posted by ryanj View Post
Absolutley, all 3 traces must be cut on the Philips board. Pin 1, 2, and 3. Cut 4 as well just in case, but i doubt it was in use, most likely was tired to GND. No reason why it shouldn't work. What is BCK running at; 2.8224Mhz? Are you over sampling? If so it may be 5.6448Mhz.
Pin 4 was connected to pin 2.

I've lifted all the connecting lines going to pins 123 and attached cables coming from my CS8412 to the input of the TDA1541.

Pin 4 is currently floating.

I'm currently getting no output from the dac, not even digital noise.

I'm considering reconnecting pin 4 to pin 2 and trying different sample rates from foobar2000
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Old 26th December 2012, 07:03 AM   #25
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by freax View Post
Pin 4 was connected to pin 2.

I've lifted all the connecting lines going to pins 123 and attached cables coming from my CS8412 to the input of the TDA1541.

Pin 4 is currently floating.

I'm currently getting no output from the dac, not even digital noise.

I'm considering reconnecting pin 4 to pin 2 and trying different sample rates from foobar2000
Try connecting pin 4 to gnd as i have. It doesn't sound like thats the problem anyway. Double check that you have connected to the right pins. If you have an occiloscope check all your i2s signals. Sorry, not familiar with the board your using.
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Old 26th December 2012, 07:09 AM   #26
freax is offline freax  Australia
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HOLY ****!! ITS ALIVE!! Yes it was the GND, I only just tried it by instinct and its working beautifully!!

Btw pin 4 is connected to pin 2 at the moment, and it isnt grounded, the picture below is an outdated picture and shows that the trace from 2 to 4 is cut, I undone that, then what I did next was, the ground that I am talking about is the one coming from the CS8412 to the TDA1541, it was that that was floating! so I just connected the gnd coming from the CS8412 to the large red trace that goes right through the middle of the TDA1541 chip and it came alive.

Click the image to open in full size.

Pin 1 is bottom left.

Click the image to open in full size.

It sounds awesome too, NO noise!
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Last edited by freax; 26th December 2012 at 07:27 AM.
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Old 26th December 2012, 07:13 AM   #27
freax is offline freax  Australia
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It sounds awesome, Go the TDA1541 NON-A!
Thank you to everyone involved, This is exactly why I made this thread, to do exactly what has been done here.

Click the image to open in full size.

And just so I can verify that this is working on a Marantz CD-65: Australian
Click the image to open in full size.
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Last edited by freax; 26th December 2012 at 07:17 AM.
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Old 26th December 2012, 07:16 AM   #28
qusp is offline qusp  Australia
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freax, if at all possible, you should have a ground wire for each of the i2s signal wires, not just one. so FSYNC/GND/SCK/GND/BCK/GND as Ryan says above me. many boards and designs incorrectly only put one, but this turns the ones without ground into noise sources, as well as being susceptible to noise
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Old 26th December 2012, 07:18 AM   #29
freax is offline freax  Australia
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Quote:
Originally Posted by qusp View Post
freax, if at all possible, you should have a ground wire for each of the i2s signal wires, not just one. so FSYNC/GND/SCK/GND/BCK/GND as Ryan says above me. many boards and designs incorrectly only put one, but this turns the ones without ground into noise sources, as well as being susceptible to noise
Roger that, I will get some cat5 twisted pair and make one wire gnd and the other a digital line, then rewire it, after I've listened to it for a while
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Old 26th December 2012, 07:19 AM   #30
josha is offline josha  United Kingdom
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Hi Freax, good stuff!

So just to clarify - you have pin 4 grounded? I ask as I have it floating on the A version but I'm still going to try the non-A just out of curiosity!

Cheers

OOPS - sorry - didn't get past 'It Works!!' scrub this question...........

Last edited by josha; 26th December 2012 at 07:24 AM.
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