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Coil Calculator for Crystal Radio

Calculate inductance, resistance, Q factor, self-resonant frequency, LC tuning range, and physical winding parameters.

1. Desired Frequency Range

Hold

Minimum frequency, kHz Maximum frequency, kHz

Hold

Coil diameter, mm Coil length, mm Number of turns Winding pitch, mm Number of layers Layer spacing, mm

Auto-calculate coil length (l ≈ N · p / layers)

Hold

Wire diameter (with insulation), mm Conductor diameter (copper), mm Insulation thickness, mm Material Wire type Number of strands Strand diameter, mm

Litz example: 20 × 0.05 mm

Hold

Frequency, kHz Parasitic capacitance ext., pF Current for energy, mA

Hold

Capacitance C, pF Minimum capacitance, pF Maximum capacitance, pF

Hold

Former/core type Core diameter, mm Relative permeability (μr) Core length, mm Core position, % inside coil

Save current project to JSON and load it later.

Target f min, kHz Target f max, kHz Target Q min N min N max Pitch min, mm Pitch max, mm

LMB: rotate, wheel: zoom, RMB/Shift+LMB: pan.

Author Zelenov Anton

Email tixset@gmail.com

GitHub github.com/tixset/CoilCalc