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Bifilar Coil

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Uploaded on Nov 29, 2010

Bifilar CoilA bifilar coil is a coil that contains two closely spaced parallel windings.There exist four types of bifilar wound coils:1.Parallel- wound, series connected;2.Parallel-wound, parallel connected;3.Counter-wound, series connected;4.Counter-wound, parallel connected. The bifilar coil is most commonly used in the following applications:1) To create a low-inductance coil with a large number of loops - This may be required to make a wire-wound resistor operating on alternating current.2) To create a circuit with parallel connected windings. The capacity of such coil will be a lot higher than that of any regular one (which allows one to use an additional capacitor in the circuit).3) The bifilar coil is a lot higher in quality than a regular one, although its wire diameter and frame are the same. This makes it a good choice for circuits and multiple-tuned transformers.4) In pulse transformers one of the windings of a bifilar coil is used as a means to dissipate the energy accumulated in the magnetic flux. Because the two coil windings are so closely spaced, they are penetrated by the same magnetic flux. One of the wires is usually grounded using a LED. So when the voltage on the other main wire is out, the magnetic flux generates current using the auxiliary (limiting) winding. The voltage on this winding is equal to the voltage drop on the diode (forward direction). Voltage of the same value appears on the main winding. Had the limiting winding not been used, the parasitic magnetic flux would have tried to induce the current in the main winding.As a result, this type of coil, invented by Tesla, is used in many electrical and radio devices. This small apparatus helps to achieve incredible results at the low cost.

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