Twisted Pear S/PDIF WM8804 Transceiver Module on TDA1541A problem - Page 2 - diyAudio
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Old 29th November 2010, 05:17 PM   #11
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Hi, I have similar problem using Y1 USB-to-IS converter. No sound, but when bypassing I2S attenuators I got sound. Y1 USB-to-IS converter supply voltage is 3.3V. What now ?
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Old 29th November 2010, 06:01 PM   #12
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Did you get normal sound?
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Old 29th November 2010, 06:10 PM   #13
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I got some interference, I think because I2S cabling and I don't have sound stage so I connected headphones directly to DAC output after IV resistor, or headphones quality is poor. Sound is normal.
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Old 30th November 2010, 01:48 AM   #14
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Ive looked deeper on the three modules (TP WM8804, Y1 PCM2707 & X2 TE7022).
All three ICs runs with 3.3V, so thats not the difference.

The X2 is the only one, witch have a BUS Buffer (74HC125) between the converter IC and the I2S output.

On the Twisted Pear and the AMB Y1 pcb lacks this buffer.

I will try to insert such a buffer IC between the output of my TP WM8804 and the I2S input of the DAC module in the next days and report the result.
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Old 30th November 2010, 11:41 AM   #15
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I have made some quick measurements with my oscilloscope:

Left: Teralink X2 BCK - Right: TP WM8804 BCK

Click the image to open in full size. Click the image to open in full size.

Left: Teralink X2 LRCK - Right: TP WM8804 LRCK

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Left: Teralink X2 Data - Right: TP WM8804 Data

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Independent from the signal quality, any thoughts?
It seems that the Buffer in the X2 made a bit more output voltage.
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Old 31st December 2010, 12:46 AM   #16
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Hello dvb-projekt

Did you succeed to made it work good ?

Thank

Bye

Gaetan
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Old 21st May 2011, 08:56 AM   #17
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Quote:
Originally Posted by gaetan8888 View Post
Hello dvb-projekt

Did you succeed to made it work good ?

Thank

Bye

Gaetan
Hi Gaetan,

sorry for the late response, but i forgot to post it here.

Read HERE about the solution.

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Old 21st May 2011, 09:24 PM   #18
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Quote:
Originally Posted by dvb-projekt View Post
Hi Gaetan,

sorry for the late response, but i forgot to post it here.

Read HERE about the solution.

Hello

Thank you

Bye

Gaetan
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