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The original passive inductor, inductance effects can produce the original referred to as inductive original, often referred to as inductance directly, it is the use of the principle of electromagnetic induction to work.
Role: blocking communication through the DC blocking high-frequency low-pass (filtering), high-frequency signals through the induction coil that will be encountered strong resistance, difficult to pass, while the low-frequency signal when it is presented by the resistance is relatively small, low-frequency signal that can more easily through it, the DC resistance of the inductor coil is almost zero.
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