Audio Inductors & Transformers
Design tools, reference data, and technical notes
Design tools, reference data, and technical notes
A collection of engineering calculators and reference material for designing inductors and transformers for audio applications—particularly EI core chokes for single-ended amplifiers.
Design chokes for single-ended Class A amplifiers. Calculates inductance, saturation margin, DCR, and frequency response.
Calculate μapp and AL from a measured inductor's inductance, turns, and core geometry.
Maximum inductance by core size and wire gauge for gapped EI cores. Includes μapp estimation guide.
Dimensions and weight-per-inch values for standard US EI lamination sizes.
Definitions of tongue, stack, window width and height, and the derived quantities every calculator here shares.
Bare copper and magnet wire specifications for AWG 10-42. Diameter, resistance, and insulation buildup.
Step-by-step walkthrough calculating maximum turns for an EI-87 bobbin with 20 AWG wire.
Understanding and calculating MLT for accurate wire length, resistance, and power loss estimates.
How lc = 6T is derived for standard EI laminations and why it matters for inductance calculations.