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punchpeanut 10th February 2004 03:28 PM

Winding your own tiny inductors
I would like to wind my own little inductors for a project I am working on. They only need to be 3uH and I seem to be having trouble finding that size.

Does anyone know of an equation for the number of turns to make one with various size wires? I found an app online, but it was a in java for loudspeaker inductors. Way too big for my project and it didn't display how the calculations were done. I would most likely just wind them around a wooden dowl.


stappvargen 10th February 2004 04:07 PM

Hi punchpeanut,

Hopefully the following thread will be of some help:



Sch3mat1c 10th February 2004 06:08 PM

Just a few turns I think.

Program I like to use for air-core is coil.exe... um I'll attach a .ZIP for 'ya.

The basic approximation that we're all familiar with only applies to certain conditions; this program apparently is very accurate. It even accounts for the form capacitance!


MODERATOR NOTE: File removed at request of owner due to copyright issues.

punchpeanut 10th February 2004 06:53 PM

Thanks so much. I figured it would only be a few turns, but didn't want to waste time, effort, and materials to do a trial and error experiment.

darkmoebius 2nd April 2004 09:25 PM

I know this thread is dead, but....
I contacted the author of the program coil.exe and he said it will only work for single-layer inductors and was intended for designing radio frequency inductors.

My own quick experimentation seems to confirm this. I entered all the physical values for a 0.65mH inductor(16 AWG, 1" dia., 1" length, 140 turns, 0l01 MHz) I have sitting on my desk and the software returned 270 mH for the inductance.

So, I don't think this is much use for audio since all our inductors are likely to be multi-layer.

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