In the figure below, IC LM$358$ includes two opamps. One is used to create a reference voltage, while the second one is connected with two current sensor TA$12$ and TA$17.$

a$)$ What is the voltage off ADC$1\_$CH$7$ and ADC$1\_$CH$6.$

b$)$ Apply a low pass filter to the signal ADC$\_$IN$.$ What is the cutoff frequency of this low pass filter.

c$)$ If we want to set a cutoff frequency is about $10$kHz$,$ what should we change in the circuit of U$3$A$.$

Please explain clearly. Thank you so much!