The PCB was designed using EagleCAD and the PCB was fabricated by OSHpark.

Its a double sided PCB with the main components mounted on the top and the coil fabricated as a continuous trace on the back which negates hand wound coils.

However, provision exists to solder an extension to the end of the coil to increase sensitivity if required.

Version 1 uses R1 to form a potential divider with the DUT whilst version 2 adds a current source to bias the DUT.

The PCB design included is for version 2.

See Components for the list of semiconductor elements and other hardware. The list of resistors and capacitors can be found in the schematic. 

R1 can be omitted if the current source is used.

The current source section has provision for additional decoupling and filtering (R25, C7 & C8), which can be populated if necessay although in use I found no issues and omitted these in the final build.

Connection to the PCB can be made at the header pin through holes with compatible pins and sockets.