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Choose Iron Powder or Ferrite and calculate required turns

To save a little time from calculating and experime nting when winding toroid cores here a chart of the most commonly used cores

This EXCEL Program Worksheet calculates the safe operating conditons for a toroidal transformer operating between 1 and 50 MHz. Manufacturer data for complex permeability, magnetic dimensions, and saturation flux density must be available. Some core types which are commonly used in amateur transmission are included. The program produces limiting winding voltages for linear operation and temperature rise over the range of frequencies and power specified.