Draw and explain Hartley Oscillator circuit diagram.
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Function of each component: 1. An NPN transistor connected in a common emitter configuration works as the active device in amplifier stage and CE configuration provides 180°phase shift. 2. R1 and R2 are biasing resistors and RE is used for stabilization of operating point against β variations. 3. RFC is the radio frequency choke, which provides the isolation between AC and DC operation. 4. CE is the emitter bypass capacitor and CC1 and CC2 are the coupling capacitors. 5. L1 and L2 forms tank circuit . The mutual inductance between L1 and L2 provides the feedback of energy from collector-emitter circuit to the base-emitter circuit. 

The frequency of oscillation is given as-

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