UJT relaxation oscillator- No feedback mechanism

Q.  Which among the below mentioned oscillators does not adopt any kind of feedback mechanism?
- Published on 23 Sep 15

a. Phase-shift oscillator
b. Wein bridge oscillator
c. UJT relaxation oscillator
d. All of the above

ANSWER: UJT relaxation oscillator

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    Discussion

  • Satyawati   -Posted on 30 Sep 15
    Apart from other classification criteria, oscillators are also divided or classified on the basis of presence or absence of feedback.

    Oscillators which uses positive feedback and exhibit their dependency on the feedback for their operation are known as 'Feedback type of oscillators', while oscillators which do not employ any kind of feedback mechanism are known as 'Non-feedback oscillators'.

    UJT relaxation oscillator does not exhibit any feedback while the phase-shift, Wein bridge, Hartley, Colpitt's, Clapp, etc. involves the feedback mechanisms.

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