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Old 3rd March 2011, 06:44 AM   #521
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I think a few detailed photos of your setup could help!
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Old 3rd March 2011, 05:44 PM   #522
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I hope it will... Sorry for the mess, i have been trying quite some things to find the problem.

How do i check whether spdif signal is locked? What is the expected output voltage at tda output?

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Thanks for your help...
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Old 3rd March 2011, 10:09 PM   #523
Malka07 is offline Malka07  England
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Hi Studiostevus,

On your dac pic, I see no signal return/gnd connected at audio out...could this be the reason for no sound?

Alon
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Old 4th March 2011, 09:21 AM   #524
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I have connected the grounds via my dmm cables. Not perfect, and i will end up with star ground once i yet everything running.
But even with imperfect gnd, there should be some sound...
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Old 4th March 2011, 10:47 AM   #525
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Did you have the V2.3 revision of the DAC module?
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Old 4th March 2011, 02:08 PM   #526
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Yep
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Old 4th March 2011, 05:42 PM   #527
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As far as i could see it on the pictures, there is no failure in the connection.
Are the 3 voltages (+5V, -5V, -15V) direct at the TDA1541A correct?
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Old 5th March 2011, 08:30 AM   #528
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Ok, so that should not be the problem.

I read somewhere that i should read 3-4V dc at the output of the tda. Can somebody confirm that, because I dont get that?

Also if i put in a test resistor to ground, i would expected at least voltages that vary with the music. I dont get that.

I do get i2s signal that varies with the music though (on/off), so my working hypothesis is that the i2s going to dac is ok.
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Old 5th March 2011, 01:23 PM   #529
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Quote:
Originally Posted by studiostevus View Post
Ok, so that should not be the problem.

I read somewhere that i should read 3-4V dc at the output of the tda. Can somebody confirm that, because I dont get that?

Also if i put in a test resistor to ground, i would expected at least voltages that vary with the music. I dont get that.

I do get i2s signal that varies with the music though (on/off), so my working hypothesis is that the i2s going to dac is ok.
Normally you should measure some small AC (mV) at the output with connected I/V resistor.
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Old 5th March 2011, 04:02 PM   #530
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The I2S switch module (e.g. USB & SPDIF) is ready

Click the image to open in full size.


- separate relays for each I2S signal to get the maximum HF-Isolation
- based on the Takamisawa NA-5WK relay, witch has minimal HF-Insertion loss
- 2mm pcb
- Immersion Gold
- green soldermask on both side
- 35m copper weight
- Board size 45mm x 35mm

The price for it is $8 (naked module as on the right side on the photo)

Worldwide shipping: $ 4
paypal fee: 3,9%

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