Inductor Material for 990 op-Amp (10 pcs)

Inductor material to make the 20uH inductors described in the Jensen 990 op-amp paper.  These are the same parts used in our JE-990 and DIY-990 kits. 

Inductors are not supplied with the copper wire you must thread through the holes to complete the full inductor. Inductor threading pattern is shown in the second and third image above. We used 30 AWG tinned copper wire.