Lots of kits these days use toroidal inductors. These are components that you have to make yourself. The kit vendor supplies a toroid core and some magnet wire, and tells you how many turns to wind.
For some people this is a real pain. Not only do you have to get the number of turns correct, but then you have to tin the leads. I don’t really enjoy tinning the leads, but I do enjoy winding the inductors. It’s one of the few instances where you’re not only building the circuit, but also building the component.
Now, Diz, W8DIZ, proprietor of KitsandParts.Com, has published a Web page titled “How to wind toroids without pain.” This page takes you step-by-step through the process. Think of it as Advil for the kit builder.
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