There are two types of inductors are widely used in electronics, fixed and variable. In certain applications such as tuned circuits, it is required to vary the inductance from a minimum value to a maximum value. Ferrite core variable inductors are generally used for this purpose, In such indicators the hollow former on which the coil is wound has screw threads in the inner hollow portion. Similar matching threads are provided on the ferrite core which can be screwed in or out of the former. Because of the change of the position of the ferrite core the value of the inductance changes. It is maximum when the ferrite core is fully in.
Tuesday, October 6, 2009
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