here are the circuit and code, the pin6 and pin9 output wrong, p6 = 2.5 V. p9: 0-5V vary, why?The amplification would have to be double sided. Amplify on send, amplify on receive. Are you sure its the current? Maybe its the voltage, coding of the signal, connector or something else?
the AB resistance value =10K;What is the AB resistance value in each digi-pot?
What impedance do the pot wipers have to drive?
What do the wipers connect to (beyond the IC)?how to figure out it?
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