Unfortunatelly I do not have the circuit details :-( But thank you very much for your help. Best regards,

Thank you for your answer.   I have an N800, looks like using that device instead would be better.   On the other hand, I do not want to have the transmitter, because this would be another RF additional to my already crowded home environment. Since I already have a wifi as a carrier...

I want to have wireless headphones, to use  anywhere in my house, audio streaming from my desktop computer over my internet wireless router (tech. specs. below).   Would it be possible to modify the SONY MDR-RF800R wireless stereo headphones for this purpose? How should I proceed? Please...