O2 amp feedback/clicking issue | Headphone Reviews and Discussion - Head-Fi.org

adupree · Feb 20, 2014 at 5:27 AM

Looking for any ideas. I just built an O2 portable amp and it powers on, but it is not passing audio. Only a loud clicking sound. I checked everything and it seems fine.

jseaber · Feb 20, 2014 at 10:46 AM

adupree said:
Looking for any ideas. I just built an O2 portable amp and it powers on, but it is not passing audio. Only a loud clicking sound. I checked everything and it seems fine.

This indicates O2 is not receiving proper power input.

Double check R25, R9, as well as all diode orientations.

adupree · Feb 20, 2014 at 3:55 PM

They are testing fine.

jseaber · Feb 20, 2014 at 4:13 PM

adupree said:
They are testing fine.

Pictures? The problem must originate in the power management section of the schematic.

adupree · Feb 20, 2014 at 7:53 PM

At the battery terminals I'm getting 29.5V

ClieOS · Feb 20, 2014 at 8:04 PM

adupree said:
At the battery terminals I'm getting 29.5V

Almost 30VDC? Isn't that way above spec?

adupree · Feb 20, 2014 at 8:10 PM

Should be 24V

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