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Replying to @josecastillo
(2/3) “The DAC on A0 drives headphone jack J1. Ferrite beads FB1 & FB2 isolate this analog circuit from the rest of the board. R6 & R7 act as a voltage divider on AVCC to set the bias of the output signal; then C6 is a coupling capacitor; it lets the AC component of the output…
(original)