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and then I realized that perhaps I was wrong, and to many people the answer was not at all that obvious The answer to the question is that all windings are wound together in a multifilar manner Because there are three windings, in this case we are talking about trifilar windings Figure 24-13B shows the trifilar winding method For the sake of clarity, I have patterned all three wires differently so that you can follow them This practice is also a good idea for practical situations Since most small construction projects use no26, no28 or no30 enameled wire to wind coils, I keep three colors of each size on hand, and wind each winding with a different color [Note: for transmitting antenna transformers use no16, no14, no12, or no10 wire] Otherwise, label the ends with adhesive labels
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Ferrite core inductors 473 The dots in the schematic, and on the pictorial, are provided to identify one end of the coil windings Thus, the dot and no-dot ends are different from each other, and it usually makes a difference to circuit operation which way the ends are connected into the circuit (the issue is signal phasing) Figure 24-14 shows two accepted methods for winding a multifilar coil on a toroidal core Figure 24-14A is the same method as in Fig 24-13B, but on an actual toroid instead of a pictorial representation The wires are laid down parallel to each other as shown previously The method in Fig 24-14B uses twisted wires The three wires are chucked up in a drill and twisted together before being wound on the core With one end of the three wires secured in the drill chuck, anchor the other end of the three wires in something that will hold it taut Some people use a bench vise for this purpose Turn on the drill at slow speed and allow the wires to twist together until the desired pitch is achieved Be very careful when performing this operation If you don t have a variable speed electric drill (so that it can be run at very low speed), then use an old-fashioned manual hand drill If you use an electric drill, then wear eye protection If the wire breaks, or gets loose from its mooring at the end opposite the drill, it will whip around wildly until the drill stops That whipping wire will cause painful welts on the skin, and can easily damage eyes permanently Of the two methods for winding toroids, the method of Figs 24-13B and 24-14A is preferred When winding toroids, at least those of relatively few windings, pass the wire through the doughnut hole until the toroid is about in the middle of the length of wire Then, loop the wire over the outside surface of the toroid, and pass it through the hole again Repeat this process until the correct number of turns is wound onto the core Be sure to press the wire against the toroid form, and keep it taut as you wind the coils Enameled wire is usually used for toroid transformers and inductors and that type of wire can lead to a problem The enamel can chip and cause the copper conductor to contact the core On larger cores, such as those for antenna-matching tranformers (and baluns used at kilowatt power levels), the practical solution is to wrap the bare toroid core in a layer of fiberglass packing tape Wrap the tape exactly as if it was wire, but overlap the turns slightly to ensure covering the entire circumference of the core On some projects, especially those in which the coils and transformers use very fine wire (eg, no30), you may experience a tendency for the wire windings to unravel after the winding is completed This problem is also easily curable At the ends of the windings, place a tiny dab of rubber cement or RTV silicone sealer
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