Hello, So I have been working on an Electrical Impedance tomography System with 8 electrodes. I managed to built my voltage controlled current source as shown in the circuit.
However for the next step, I need to connec the output of the current source to input of demux ( I chose to go with CD4051). My setup is that basically with one demux I choose one of the electrodes and with another multiplexer ,I ground another adjacent electrode such that current flows through them . How ever, as soon as I make the connections, all the channels of mux and demux are showing output and I am not able channel anything. Why is that? I am using same ground for all.
This is the circuit for mux basically .
However, instead of 16 electrode setup, I am using 8 channel mux and 8 electrodes.