The question almost states itself. Without positive feedback, there can be no oscillation (at least of a steady-state type). The feedback must be applied at an appropriate part of the oscillatory cycle, as well as at the appropriate level.
Feedback oscillators have a closed loop gain of
Positive feedback is used in oscillators to keep them running or oscillating. An oscillator is basically an amplifier which has a feedback path from the output back to the input. This permits a portion of the output signal to get back to the input to "keep things going" in stage - to keep things oscillating. The feedback must be positive so that it will "contribute" to the stage being able to keep oscillating. If the feedback was negative, it would serve to damp the oscillation and to "kill" the oscillator.
unity
Oscillators produce a waveform (mostly sine or square waves) of desired amplitude and frequency. They can take input from the output itself. For a complete oscillator circuit we require a feedback device, amplifier and feedback factor.
Is the clotting of blood an example of positive or negative feedback?
positive feedback is always benificial but regenerative feedback may or may not.
Positive feedback.
A: Any feedback that contributes to the input is positive feedback any feedback that subtract from the input is negative feedback
Positive feedback Positive feedback
The positive feedback loop is terminated by the end of childbirth...
A positive feedback mechanism is a system the responds to perturbation in the same direction as the perturbation. A positive feedback mechanism allow cells to adapt to changes in their environment rapidly and efficiently. Positive feedback allows cells to reach new levels of equilibrium corresponding to the stimulus in the environment
when the imput signal is so much that is oscillates the speaker, all an oscillator is defined as a device with A.C. feedback.