about headphone amplifier using ad8132

Hi YTohyama451,

For any amplifier whose input or output is exposed to the "outside world", you should include filters to prevent out-of-band signals from causing problems. For an audio application, this would be anything below 20Hz (including DC offsets, a short circuit to ground, etc.) and above 20kHz. While 2.4 and 5GHz are causing problems for you now, note that there are plenty of EMI sources in the 50-100kHz range - offline switching power supplies, for example.

This is not an exact science, there are lots of approaches that work, but this document does a pretty good explanation. 

https://www.analog.com/media/en/training-seminars/tutorials/MT-096.pdf

-Mark

thx Mark,

this document is helpful.

I'm going to try some common mode chokes.

and also going to use ad8131.

best regards,

thx Mark,

this document is helpful.

I'm going to try some common mode chokes.

and also going to use ad8131.

best regards,