SAM9N12-EK WM8904 sound card input voltage problem

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SABATI
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Joined: Wed May 06, 2015 10:23 am

SAM9N12-EK WM8904 sound card input voltage problem

Tue Jul 14, 2015 5:27 pm

Hi,

I have an evaluation board(AT91SAM9N12-EK) running linux with WM8904 sound card. With normal input on its line in, I cannot hear anything. Like I plug my Laptop or Smartphone's line out into the board's line in and do arecord(alsa driver) and nothing can be heard. I also tried Signal Generator 10mV - 1.2Vss but nothing can be heard.
But when I use high Input Voltage Signal from Signal generator 100mV-20Vss then I can hear the signal.

What could be the problem ? Is it something related to drivers or some hardware issue ?
Thanks.

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