This type of circuit is mostly found in Radio transmitters, receivers and frequency selection applications.
Capacitor works along with Inductor in these circuits to do the job. Tank or Tuned circuits will be employed when we need to generate a signal or receive a signal of particular frequency from complex signal with multiple frequency components in it and that’s where the word “Tuned” came from. The elements in this circuit C and L can be tuned as per our need.
The working of above circuit is based on Reactance of both Capacitor and Inductor. Like Capacitor, Inductor does exhibit Reactance. But unlike Capacitor Inductor exhibits high reactance to high frequency signals whereas Capacitor exhibits high reactance to low frequency signals.
This tank circuit will be constructed in a way where reactance of both the elements Capacitor and Inductor will be equal at a frequency thereby achieving Resonance. At Resonance this tank circuit is capable of generating signals of assigned frequency or receive signals of that frequency.
Here is how it works, when the Capacitor connected in this circuit is charged, it stores the charges between in its plates.
The current from Capacitor will then move to Inductor which in turn will build up a magnetic field around it.
This results in depletion of charges across the plates and Voltage across its drops to zero. Inductor has the property of resisting change in flow of current through it.
Once the current from Capacitor stops, magnetic field of Inductor collapses enabling the current to flow through the circuit. This current reaches the Capacitor and charges it again building charges in its plates and develops voltage across it.
This cycle continues to repeat over and over again generating signals of resonant frequency. We can also use this circuit to extract signals of this frequency from a complex signal.
Enjoy...😎
