Teensy Audio Shield Capacitor's are not polarized? Right?

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josechow

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I have never seen a polarized surface mount capacitor that wasn't marked, but based on the schematic there is a 2.2uF polarized capacitor between left/right channel to LINEINL/LINEINR to the SGTL5000 of the audio shield. I don't think its polarized, but I just wanted to double check before I layout my board connecting to the audio shield and other components.

EDIT: I am looking at this page. https://www.pjrc.com/store/teensy3_audio.html
 
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I found this link to a similar question, after some digging... though it didn't answer the question.

https://forum.pjrc.com/threads/27128-Teensy-Audio-board-ADC-DAC

I intend to feed a 6v dc biased ac audio signal to one of the channels to which there is a (annotated polarized) 2.2uF capacitor for LINEINL or LINEINR. From the SGTL5000 datasheet, there is a typical application section which shows the appropriate connections to these pins, but shows a non-polarized 1uF capacitors, and not a polarized 2.2uF.

For all intensive purpose, from my own observations, they do not seem to be polarized capacitors from the pictures of the physical board; But, the schematic shown on the same store page where I ordered the audio board shows polarized capacitors.

Has anyone had any experience in placing a dc bias on the input audio pins of the audio board?

EDIT: I know why the values changed from 1uF to 2.2uF, I was just trying to show I actually looked elsewhere rather than trying to pump y'all for information without doing some research myself.
 
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The 2.2 uF capacitors on the audio shield are not polarized.

I'll ask Robin to look up the voltage rating and dialectic spec for the ones we're actually using....
 
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