Insulated versus not insulated copper wire

Is it possible that what you see as uninsulated wire is really wire that has an enamel insulating coating? This type of wire is used on transformers and inductors and looks like bare wire but in fact is quite well insulated. Here is a coil that I wound using enameled wire that may look uninsulated but really is insulated.

John

What is the material in that transformer?  Is it 52 mix?  Is that a transductor or a transformer?  What size core?  How many turns?  What inductance?  What SRF? Why did you array the coils separately as you have, rather than wrap the core with a twisted pair?  What potentials are you operating at?  If that is used in some kinda saturation-based gadget oscillator, what frequency does it operate at?

How you doin'?

Hi Don,

It is a ferrite 0.5 inch core. The wire came out of a small transformer that I salvaged from an old computer switching supply. There are (2) 20 turn windings. If the windings are not arrayed properly the reason is ignorance. As far as winding it was very difficult with these old eyes. I was nearly permanently cross-eyed when I finally completed it. It is part of a Joule Thief circuit operating at 1.5 volts. I believe the frequency was about 45kHz.

John

Note that when you add windings to a core, you are increasing your B over an area, rather than a line.  So if your twenty turns yields N quatloos of inductance, putting forty turns upon the same core yields 4*N quatloos of inductance.  Since you paid for a finite number of magnetic domains when you bought your core, saturation in the latter situation would come proportionately sooner.

Note that when you add windings to a core, you are increasing your B over an area, rather than a line.  So if your twenty turns yields N quatloos of inductance, putting forty turns upon the same core yields 4*N quatloos of inductance.  Since you paid for a finite number of magnetic domains when you bought your core, saturation in the latter situation would come proportionately sooner.