LC Resonant Frequency
Also known as tank circuit frequency · tuned circuit
Enter your known values, leave one input blank, and solves for the missing one. Try different units for next level excitement!
Learning zone
Connect a charged capacitor to an inductor and the energy sloshes between electric and magnetic field at one natural frequency — the electrical twin of a mass on a spring, with L playing mass and 1/C playing stiffness. A 100 μH coil with a 250 pF capacitor rings at about 1 MHz, in the AM broadcast band; turning an old radio's tuning knob physically varied C to slide this resonance across the dial. Every radio transmitter, RFID tag, and quartz-stabilized oscillator descends from this circuit.
LC Resonant Frequency
Where
- = Resonant frequency
- = Inductance
- = Capacitance
Missing one of these? Work it out first, then come back
- Resonant frequency — Wave Speed (v = fλ), Period-Frequency Relation
- Inductance — Energy Stored in an Inductor, Inductive Reactance (X_L = 2πfL)
- Capacitance — RC Time Constant, Capacitance (C = Q/V)