The above chart shows typical Q curves resulting from a number of various windings on the same toroidal core.

The next page contains links to a number of Q curves which were measured and plotted from actual windings. Click on the thumbnail version of the Q curve you need to download it for your reference.

Inductance charts are given later on in this booklet which will help you choose a core for a specific inductance. Since the charts are in increments of ten turns, a more precise turns count can be calculated with the turns vs. inductance equation once the core has been selected.

Downloadable .zip files of the q-curves for specific cores at frequencies from 10Khz through 400 Mhz will soon be available.