# how to make the inductor for a Thiele Network (LM3886)?

#### mrjayviper

so i have what it looks like 1mm(measured using a cheap digital caliper) diameter enameled copper. How do I make an inductor out of it? I know I need to make a "loop" but unsure on how big or how many turns.

I searched the net but didn't see anything helpful.

thank you.

#### asuslover

But if you search

### thiele network inductor​

on the internet you will find a lot of informations.
On this site it was discussed a lot of times,
I don’t know, maybe I’m in a bad mood tonight, but is anyone else getting a little bit annoyed by these repetitive posts/threads/questions?

#### markbakk

iIRC you can take a 10R 3W carbon resistor and use two layers of windings around it.

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#### newvirus2008

so i have what it looks like 1mm(measured using a cheap digital caliper) diameter enameled copper. How do I make an inductor out of it? I know I need to make a "loop" but unsure on how big or how many turns.
I guess you'd need around 1-2uH for which you just take a 3/4 inch (18mm) curtain rod and wind 7-10 turns on it, slip it through and put some glue if you want. The shunt resistor, like mentioned above, may run through the inside of it, simplifying PCB routing.

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#### tomchr

Paid Member
I recommend finding an equation or online calculator to calculate the inductance of an air core inductor. Then wind the inductor so it has the inductance you desire.

Tom

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#### newvirus2008

According to Farley's link (post#2), winding 7 turns of 1mm wire (which you already have) on a 3/4" former gives 1uH of inductance that is suitable for a Thiele Network. Adjust one or two turns up or down if needed.

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