Here i will show my version of thei Linear Technologies 0.1-10Hz Test circuit which they publish in several Datasheets.
It is a Gain of 5 non inverting amplifier. The OP Amp is an LT1001.
Here is the schematic.
For low Noise and to avoid other mains interferences, it’s recomendet to Power the Amplifier wirh Batteries. Therefore I use two 9 Volt blocks.
I build the circuit on flying on a single side copper board which i use as a ground plane.