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CHOKE COIL

        Chock coil is for anti-interference .Computer board, CPU, and IDE cable are working in the high frequency condition, stray electromagnetic interference signal exists due to the large amount of space and the intensity of the signal is several times to dozens times of outside of case! USB cable without choke coil in this space isn’t shielded. The USB cable will become very good antenna, receiving all kinds of clutter in the surrounding environment of high frequency signals, and the signal superimposed on the original transmission signal, even change the original transmission of useful signal, it's easy to have a problem.

       Ferrite cores also called ferrite beads used in removable separate core, it is commonly used in electronic circuit as anti-interference components, have very good inhibitory effect to high frequency noise, generally use of ferrite materials (Mn - zinc).Core will be different frequency impedance characteristics. in the low frequency impedance is very small, when the signal frequency impedance rise sharply,core’s resistant increases sharply. That can restrain the high frequency interference signal and pass the useful signal , and cost is low.


    
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