Explain briefly the action of a transistor as a tuned collector oscillator.

Explanation

Circuit diagram,
Working: When the circuit is switched on, the surge current flows in the collector current though the current does not reach the maximum value instantaneously, it rises sinusoidally and due to feedback, current will be in the same phase. Hence the nature of feedback is positive. When the current reaches the saturation point, magnetic field becomes contant. the feedback stops and hence emitter current begins to fall. this causes the magnetic field in the collector current to decay until emitter current is is nearly zero. In the absence of collector current and emitter current , the transistor will be driven to cut-off. The frequency of change from saturation to cut-off is given by the formula v = `(1)/(2pi sqrt(LC))` Hz