I am currently trying to play audio with my Colibri IMX8DX mounted on an Aster carrier board and I have a doubt about the components that are necessary to do just that. I have soldered a few pins in the X14 connector place so I can easily connect a headphone or speakers, to try out my application, but I am not able to solder the capacitors c74 -78 for now.
I can see they are very weak, only 15 pF, so I’m guessing they are only meant to filter out noise and I should be able to try and play some sound without, but I’d love some confirmation on that!
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Hello,
Thank you for reaching out with your question about audio output on Toradex hardware. Capacitors play a crucial role in ensuring proper audio functionality. According to the documentation, headphone output signals can have a DC offset, which necessitates the use of series capacitors for optimal operation. For these signals, it is recommended to use capacitors of 47μF or larger.
Without the appropriate DC blocking capacitors, the audio output circuit may produce poor quality sound. Therefore, it is highly advisable to use DC blocking capacitors in series with the AUDIO_HEADPHONE_R/L signals.
For testing purposes, you might consider the following steps:
Use external DC blocking capacitors in series with your audio connections.
Utilize AGND_AUDIO as the reference ground.
Refer to the Colibri Evaluation board schematic for a reference circuit design.
To ensure proper audio functionality, it is recommended to install the appropriate capacitors before proceeding with audio testing. This will help avoid potential issues with audio quality and DC offset.
I hope this information is helpful for your project.
Not quite, I understand its point and will most likely try adding these DC blocking capacitors once the time comes, but my question was initially about these capacitors here:
