Yeah sure, see the attached.
If you cant make it out it goes from left to right as
1) full-bridge circuit
2) 3 op-amp instrumentation amplifier
3) Phase sensitive detector switched by a CMOS 4066 and driven by a square wave from LM311 comparator
This is for a university presentation.
Thanks
also its not finished yet so after the PSD will be a low pass filter then a howland current source.