Hubert -
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If both the WM8731 and SI5351 are connected correctly the UI will start.? You do not need the RTC or the SWR Sensor (ATTINY85).??
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See if you can play a youtube video on the Pi and hear soud out of the speaker - that will tell you if the WM8731 is wired correctly.
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When you say you finished wiring the sBitx what do you mean? What have you actually built???
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73,
Dean
KK4DAS
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