Crystal Radio Coil Winding

Winding a radio coil is very easy. In this project, I am building two radios, and I decided to build one coil with Long Wave reception, and another coil with a Medium Wave Reception. The MW reception coil is in the Crystal Radio Coil article.

In this article, I am using 26 SWG single core copper wires, with 100 turns wound around a ferrite rod, to make a LW reception coil.

Here is a close-up of what it should look like. You need to have a neat and tightly packed coil.

Just for fun and for experimental purposes, I am winding an additional separate coil with around 20 turns. This could be used to see what would happen if the coil length was increased.

Above the white tape, you wind 20 turns of the same type of coil. The winding must be in the same direction as the previous coil.

Just as before, secure the coil ends with some more insulating tape as shown above.

This additional winding can also extend the Long Wave band reception.

Mounting the Ferrite Coil

A hot glue gun is very useful, as it can save you a fortune from having to buy screws and clips.

If I had a large budget, or if I had some recycled clips, I probably would have used them, however, this is the quick and cheap way of securing the ferrite rod.

I only hope I do not ever have to remove these clips, because it secures very robustly. Now all that remains is to prepare the coil wires by cutting them to the required length and tinning them with solder.

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