![]() Parallel LC circuit with resistance in series with L. Watch, though, where current reaches maximum or minimum in the following SPICE analyses: Calculating the Resonant Frequency of a High-Resistance CircuitĪccording to our simple equation above, the resonant frequency should be 159.155 Hz. On this page, we’ll take a look at several LC circuits with added resistance, using the same values for capacitance and inductance as before: 10 ♟ and 100 mH, respectively. However, as soon as significant levels of resistance are introduced into most LC circuits, this simple calculation for resonance becomes invalid. In a series LC circuit, it means zero impedance at resonance: ![]() In a parallel (tank) LC circuit, this means infinite impedance at resonance. ![]() In simple reactive circuits with little or no resistance, the effects of radically altered impedance will manifest at the resonance frequency predicted by the equation given earlier.
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