I took two inductors from a computer power supply to make an inductor for a project. I'm using coil32s' android app to calculate the wire turns but there it is asking about relative permeability of core. I don't know how to calculate them. I read and found that it is dependent on the material and the colour of the core...
I have one green and one little bit lighter green core and they have some label in them... Tell me the relative permeability of both if possible.
(Apology for the orientation)

 

Hello,

It depends on the material.
It can be powedered iron or ferrite.
Have a look at the attached PDF's.

Bertus

 

Hello,

It depends on the material.
It can be powedered iron or ferrite.
Have a look at the attached PDF's.

Bertus

Thank you

 

Hello,

Perhaps the following page might help:
http://zpostbox.ru/how_to_determine_permeability_of_unknown_cores_online_calculator.html

Bertus

 

Hello,

Perhaps the following page might help:
http://zpostbox.ru/how_to_determine_permeability_of_unknown_cores_online_calculator.html

Bertus

I purchased new toroidal core and wound 104 turns of 21 gauge wire according to the calculation of coil32 software and considered permeability to be 8 as per your pdf. And here it how it looks

My only concern is i have wounded both in clockwise manner... Is it okay?

 

Hello,

Here is a PDF with some practical tips for the use of toroid cores.

Bertus

 

Hello,

Here is a PDF with some practical tips for the use of toroid cores.

Bertus

This PDF only talks about the RF circuit and inductors used in filters in Audio circuit. It says there should be 30 degree gap between the adjacent windings which must be true for RF application because in those circuit low value inductors are used (my assumption ).
Considering 100uH on a core which has 3.3cm outer diameter while maintaining 30degree gap would be impossible.
Above are just my opinion about the same.
If I'm wrong please correct me.

 

Also i have not yet measured the actual inductance of the coil i made... I will do it as soon as i get hands on a lcr meter.