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A Level     AC Circuits     Active Filters     Passive Filters     >Tuned Circuits<    

AC Circuits Tuned Circuits


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An inductor and variable capacitor designed for high transmitter voltages.

LC Tuned Circuit

Tuned Circuit Properties

At the resonant frequency ...

Tuned Circuit Measurements

Tuned Circuit Resonance Circuit

Q or Quality Factor

Tuned Circuit Q-Factor

Below the resonant frequency

Above the resonant frequency

At the resonant Frequency

XC and XL are equal and cancel each other out. In an ideal circuit, the impedance would be zero. In a non ideal circuit, the inductor has a DC resistance. The capacitor is usually so close to ideal that its losses are ignored. See Dynamic Resistance below ...

Tuned Circuit Formulas

Tuned circuits work like this ...

Here is a water analogy.

 

Tuned Circuit Animation

Ferrite Rod Tuned Circuit

Note the small variable capacitor and thin coil wire used for low receiver voltages.

Ferrite Rod Tuned Circuit and Antenna

Ferrite Rod Details for Maplin LB12

This doubles up as the antenna and tuned circuit in low cost radio receivers designed for the long wave (LF) and medium wave (MF) bands.

The addition of the ferrite greatly increases the inductance of the coils. This reduces the resonant frequency.

Ceramic Resonators and Quartz Crystals

These devices also exhibit strong resonant behaviour. They can be used in filter circuits and oscillators replacing the conventional tuned circuit. The advantages are small size, low cost and a high Q factor. However they can't be tuned like an L C circuit.

Inductors can be BIG

Large antenna loading coil

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