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- This is a signal from the output back to the inverting (-) input.
- It controls the gain.
- It reduces distortion.
- It corrects errors in the output. This is really the same as reducing distortion.
- This is a signal from the output back to the non-inverting (+) input.
- In the Schmitt trigger circuit ...
- positive feedback creates the two different reference voltages.
- positive feedback guarantees the fastest possible switching of the output once a threshold voltage has been reached.
- In oscillator or astable circuits, positive feedback causes the instability that leads to oscillation.
- Parasitic Oscillations ...
- Unwanted positive feedback can cause unexpected parasitic oscillations.
- Good decoupling, screening, single-point earthing and equalisation all help to eliminate unwanted positive feedback.
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