I am trying to replicate the circuit in this paper: http://chrisharrison.net/projects/electrick/electrick.pdf
I have followed the schematic in Figure 7 and utilized Howland current source as described in the prior post: Building a VCCS with AD8220 Instrumentation Amplifier
Currently, I have an AD9850 with a 1 Vpp 100 kHz output. This wave is passed through Howland current source, which should yield a current < 1 mA.
My question now is how is the EIT field established? I am trying to understand based on Figure 1 in the paper, but I do not know how that translates to my setup. Are all the adjacent electrodes connected to each other? When I establish a current receiving pair, is Iout going to one electrode while the adjacent electrode is connected to ground?