Mini Ring Core Calculator - Resource Detail - The DXZone.com
GitHub - radioacoustick/Coil64: Coil64 is inductance coil calculator, that allows to calculate the single-layer and multi-layer air core inductors, the ferrite core inductors or chokes, planar coils on PCB etc.
The Self-Capacitance of Toroidal Inductors. David W Knight.
Coil32 - Amidon ferrite toroids calculator
Coil32 - Ferrite torroid calculator
How to Build a UN-UN – Amateur Radio Website
Coil32 - Amidon ferrite toroids calculator
Band Pass Filter controlled by Arduino | auto_bpf_arduino