I've managed to solder AV-OUT, Audio Out and Mic In to the solder points. AV and audio out work without problem but Mic In has noise on output. I've tested all point (Positive, Negative and Bias) but all of them has noise on output even with my designed Pre-amp.
With OrangePi Mini2 I solder the pre-amp to mic pins and there is no noise. Is there any difference between solder points on mini2 microphone on board and solder points on Opi ONE ?
Can you please tell me what's wrong and the correct way to plug a microphone to the board ?
Can you please give me the block diagram for audio out,TV out and mute for Orange pi LIte , i can solder from LIneOutR,LineOutL,TVout,Mute but i don't know where to connect in GIPO port for another lead