Current-voltage conversion circuit diagram

The picture shows the current- voltage conversion circuit diagram . Change the value of the negative feedback resistor to select the appropriate amplification factor, and then restore it to the original value by dividing by the channel coefficient in software. According to the actual signal range, C2 and C3 are memory capacitors. It is appropriate to use polyester film capacitors with small leakage current , with a size of 0.1uF. The resistors in the circuit are all screened metal film resistors. In order to eliminate the ripple of the analog circuit output caused by the 50Hz power frequency ripple and its higher harmonics in the power supply, an RC low-pass filter is added to the output of the amplifier.