Used coil Inductors role

The self-induced electromotive force in the coil always counteracts the change in current in the coil. The inductors coil has a blocking effect on the AC current, and the size of the blocking effect is called the inductive reactance xl, and the unit is ohms. The relationship between it and the inductance l and the AC frequency f is xl=2πfl, and the common can be mainly divided into high frequency choke coil and low frequency choke coil.

Tuning and frequency selection 

IC tuning circuit can be formed by connecting inductor and capacitor in parallel. That is, the natural oscillation frequency f0 of the circuit is equal to the frequency f of the non-AC signal, then the inductive reactance and capacitive reactance of the circuit are equal, so the electromagnetic energy oscillates back and forth in the power inductors and capacitor, which is the resonance phenomenon of the lc circuit. When resonant, the inductive reactance and capacitive reactance of the circuit are equivalent and reverse, the inductive reactance of the total current of the circuit is minimum, and the current flow is maximum (refers to the AC signal of f= "f0"), and the lc resonant circuit has the effect of selecting the frequency, which can select the AC signal of a certain frequency f.

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