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- TL;DR Summary
- Help with understanding of Q factor difference of a toroidal closed trifilar winding verses conventional single winding of same inductance.

Hi,

I am experimenting with a design for an inductor for audio applications, and am using a high permiability toroid (12,000) having a closed trifilar winding. In this instance , it is 39T x 3 twisted wires connected in series being 117 turns in total, giving approx 180mH inductance.

In regards its Q when resonant with a small cap, I would like to know how much benefit in Q would be obtained to instead wind a single 117T coil to obtain the same inductance. I do not know how much the closed trifilar wind degrades the Q factor due to what I presume would be greater self capacitance, and hence if it is worthwhile trying to create a single wound coil.

I originally chose a trifilar wind, as it cuts down the number of turns on the (smallish) toroid, saving space. Can someone please advise me on this, and perhaps help me understand the principles involved. Thanks.

I am experimenting with a design for an inductor for audio applications, and am using a high permiability toroid (12,000) having a closed trifilar winding. In this instance , it is 39T x 3 twisted wires connected in series being 117 turns in total, giving approx 180mH inductance.

In regards its Q when resonant with a small cap, I would like to know how much benefit in Q would be obtained to instead wind a single 117T coil to obtain the same inductance. I do not know how much the closed trifilar wind degrades the Q factor due to what I presume would be greater self capacitance, and hence if it is worthwhile trying to create a single wound coil.

I originally chose a trifilar wind, as it cuts down the number of turns on the (smallish) toroid, saving space. Can someone please advise me on this, and perhaps help me understand the principles involved. Thanks.