Looking at the one board I haven't really monkeyed around with, it has one bobbin-wound inductor, two toroidal inductors, and one toroidal transformer.

Are there any recommended online resources for "rolling your own" toroidal inductors?

When removing windings to change the inductance, how does one tell which end to start from and are turns counted from the inside or the outside?

 

Looking at the one board I haven't really monkeyed around with, it has one bobbin-wound inductor, two toroidal inductors, and one toroidal transformer.

Are there any recommended online resources for "rolling your own" toroidal inductors?

When removing windings to change the inductance, how does one tell which end to start from and are turns counted from the inside or the outside?

You go to the websites put up by the manufacturers of the materials. Everything you could want or need is there.

 

Looking at the one board I haven't really monkeyed around with, it has one bobbin-wound inductor, two toroidal inductors, and one toroidal transformer.

Are there any recommended online resources for "rolling your own" toroidal inductors?

Plenty

When removing windings to change the inductance, how does one tell which end to start from and are turns counted from the inside or the outside?

Turns are counted by passes through the center. Period. I don't know what you mean by inside or outside.

 

You mean like this?

https://66pacific.com/calculators/toroid-coil-winding-calculator.aspx

 

I eventually found a later version of this circuit that uses a safer voltage level for the drive circuitry AND only requires ONE inductor - and which value is 'close nuff' to an off-the-shelf part, that I can probably subtract a few turns to adjust the inductance down a bit (alternatively, I have a few boards of this later version that can be scavenged for coils).

 

Hello there

I think your going to need
this in your travels...I mean that in the best possible way.

 

This is a fairly simple tutorial on winnding toroid inductors
http://www.cappels.org/dproj/Toroid_winding/Toroid_Winding.html