Parallel RLC Resonant Tank

A parallel RLC circuit connects a resistor, inductor, and capacitor across the same two nodes. Around resonance, the inductor and capacitor exchange energy and their reactive currents largely cancel at the source. The remaining loss resistance controls the sharpness of the response. This small schematic is useful for explaining tank circuits, selective loads, and the difference between parallel and series resonance. The source is shown as an AC test signal; in a real oscillator, an active device supplies the sustaining energy. Choose real component values and include coil resistance, loading, and parasitic capacitance when the design will be built. Record the expected resonant frequency beside the drawing.