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Question
What is an oscillator? Explain use of transistor as an oscillator under the following points:
(i) Labelled Circuit diagram,
(ii) Working.
(i) Labelled Circuit diagram,
(ii) Working.
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Solution
Oscillator: Oscillator is a device which can produce high frequency oscillation.
(i) Labelled Circuit diagram : (ref. image)
(ii) Working: As the key K is pressed, the electrical oscillations begin in the L1−C1 circuit or tank circuit. Inductance L is properly coupled with L1, there an induced e.m.f. is produced in L and its direction and magnitude both are changing. Thus, a flucting collector current is produced due to the flucting base potential, which helps the electric oscillations in tank circuit and hence an oscillation of conduct amplitude is produced in L1−C1 circuit. The energy is fulfilled by the battery.
(i) Labelled Circuit diagram : (ref. image)
(ii) Working: As the key K is pressed, the electrical oscillations begin in the L1−C1 circuit or tank circuit. Inductance L is properly coupled with L1, there an induced e.m.f. is produced in L and its direction and magnitude both are changing. Thus, a flucting collector current is produced due to the flucting base potential, which helps the electric oscillations in tank circuit and hence an oscillation of conduct amplitude is produced in L1−C1 circuit. The energy is fulfilled by the battery.
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