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yellow green blue variable inductor coils radio circuit board electrical inductance focused components wire device background electricity connection capacitor tuned-circuits low-frequency receiver antenna-tuners windings permeability detail hardware equipment closeup conductor ferromagnetic-inductor parasitic-capacitance multilayer-rf-coils tuned rf-coil magnetic-resonance magnetic-field electrical-component electric-field modify variometer impedance electronic diode engineering electrical communication circuit board card circuitry adjustable frequency radio electric component magnetically coil electrical-inductance induction microhenry ferrite-core inside-of-radio