(TECH) Mute lineout when no sound

I have problem, i connected amplifier to OU_HPL and GND. I managed to get sound out of it, but there is lot of noise, especially when the module charges battery. This is because I don’t use AUDIO_GND as Linkit One is using (the FM_IN)?

Is there a way, how to get it working with this small module?

Thank you


You just connect the AU_HPL(which mean audio_headphone_left_channel) to the amplifier? I think may be the circuit lack of some filter circuit, especially the blocking capacitors. May be you can reference to the headphone circuit of LinkIt One, add some filter before you connect the amplifier.