DIY coils

[rendoman]

Hi all!
I just built a pair of matched coils for my new little speakers, passive crossover filter.

I would recommend a good free software: coil32, there are many available, this one is pretty friendly and accurate.

I needed 0,3mH air core coils, I build with lathe a Delrin sprockets and wind by hand. Simulations are very close to the real value, I had to trim few turns to reach the correct value. Copper is a high quality from italian brand, double layer enamel.

I measured both coils, resulted 0,298mH and 0,66 ohm, a perfect match for my filters.

That's the software used:
https://coil32.net/download-coil64-for-windows.html