This is actually a pretty simple op-amp circuit. The tricky amplifier stuff is all in the OPA2107 chip; everything else is either part of the power supply, or a

This is actually a pretty simple op-amp circuit. The tricky amplifier stuff is all in the OPA2107 chip; everything else is either part of the power supply, or a straightfoward arrangement of resistors and capacitors to get the op-amp to do the right thing. The really cool part here is the assembly. That thing is very pretty.