.net barcode reader free Winding a toroidal transformer A) parallel wound, B) twist wound in Software

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24-14 Winding a toroidal transformer A) parallel wound, B) twist wound
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474 Impedance-matching in antenna systems Mounting toroid cores Now that you have a properly wound toroidal inductor or transformer, it is time to actually mount it in a circuit being constructed There are three easy ways to do this job First, you might be able to ignore it If the wire is heavy enough, then just use the wire connections to the circuit board or terminal strip to support the component But if this is not satisfactory, and in mobile equipment (or wherever else vibration is a factor) it won t be, then try laying the toroid flat on the board and cementing it in place with silicone seal or rubber cement The third method is to drill a hole in the wiring board and use a screw and nut to secure the toroid Do not use metallic hardware for mounting the toroid! Metallic fasteners will alter the inductance of the component and possibly render it unusable Use nylon hardware for mounting the inductor, or transformer How many turns Three factors must be taken into consideration when making toroid transformers or inductors: toroid size, core material, and number of turns of wireThe toroid size is selected as a function of power-handling capability, or for convenience of handling The core material is selected according to the frequency range of the circuit The only thing left to vary is the number of turns The size and core material yields a figure called the AL factor The required value of inductance and the AL factor are used in the following equation:
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where: N is the number of turns L H is the inductance in microhenrys AL is the core factor, in microhenrys per 100 turns Example Calculate the number of turns required to make a 5- H inductor on a T-50-6 core The AL factor is 40 Solution:
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Don t take the equation value too seriously, however, because it is my experience that a wide tolerance exists on amateur-grade ferrite cores Although it isn t too much of a problem when building transformers, it can be critical when making inductors for a tuned circuit When you find that the tuned circuit takes considerably more (or less) capacitance than called for in the standard equation, and all of the stray capacitance is properly taken into consideration, then it may be that the actual AL value of your particular core is different from the table value
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Ferrite core inductors 475
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Ferrite rods
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Another form of ferrite core available on the market is the rod, shown in Fig 24-15A This type of core is used to make RF chokes, such as the RFC used in the vacuum tube filament lines of a linear amplifier power tube (Fig 24-15B) They are also used for baluns by some people The two windings are wound in a bifilar manner over the ferrite rod Of course, the wires used must be heavy enough to carry the filament current of the tube As was true in the toroidal transformer, I use two different wire colors in order to make it easy to identify windings Ferrite rods are also used in receiving antennas Although the amateur use is not extensive, there are places where a ferrite rod antenna (or loopstick ) is used For example, in radio direction finding antennas, it is common to see the ferrite loop Also, some amateurs report that they use a loopstick receiving antenna when operating on crowded bands, such as 40 and 75 m The small loopstick has an extremely directional characteristic, so it is capable of nulling out interfering signals Of course, you would not want to use the loopstick for transmitting, so some means must be found for transferring the antennas over between the transmit and receive functions Mounting ferrite rods Ferrite rods can be mounted in several ways, two of which are analagous to the methods used on toroids We can, for example, mount the rod using either its own wires for support or by using a dab of cement or silicone sealer to fasten it to the board Although we cannot use simple nylon screws the way we can on toroids, we can use insulating cable clamps to secure the ends of the rod to the board
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