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Which of the following oscillator is used as 1230 Hz oscillator?

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Which of the following oscillator is used as 1230 Hz oscillator?

(a) Hartley oscillator

(b) Crystal oscillator

(c) RC oscillator

(d) Wien bridge oscillator

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I'd like to ask this question from Instrumentation of ESR Spectrometer topic in chapter Electron Spin Resonance Spectrometers of Analytical Instrumentation

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The correct choice is (d) Wien bridge oscillator

For explanation I would say: Wien bridge oscillator is used as 1230 Hz oscillator. The output level is internally regulated.

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