Inductance is uses the principle of electromagnetic induction to work. Hollowself-adhesive coils when current flows through a wire coil occurs when self-adhesive, self-adhesive coils of certain electromagnetic field around the wire,and the electromagnetic wire and wire of electromagnetic field in the planningin the induction effect of hollow hollow coil. Self-adhesive coil electromagnetic field has effect, called the 'self', namely the conductor current change what happened change magnetic hollow coil, the magnetic field is further affected the electric current in a wire to wire it; at the other the audio coil of an electromagnetic field planning effect, called 'Transformers'.

The inductance coil of the electrical characteristics and capacitor instead,'resistance high frequency, low pass. That is to say, the high frequency signalthrough the inductance coil will encounter great resistance, it is difficult to pass through; and on the low-frequency signal by which the resistance is small, i.e.,low frequency signal can easily pass through it. The inductance coil DCresistance to almost zero. The audio coil resistance, capacitance and inductance, they to stream audio coil signal circuit dynamic will appear some resistance, the resistance of known use as' impedance impedance 'inductance coil which appears on the current signal is self inductance coil coil. Sometimeswe call it' the inductance 'or' coil ', indicated by the letters'L'. The windinginductance coil, the number of coils wound we called it the coil turn number ''.The above is the effect principle of hollow coil, as Dongguan hollow coil in the market has its independent status and advantage.