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- Positive_feedback abstract "Positive feedback is a process in which the effects of a small disturbance on a system include an increase in the magnitude of the perturbation. That is, A produces more of B which in turn produces more of A. In contrast, a system in which the results of a change act to reduce or counteract it has negative feedback.Mathematically, positive feedback is defined as a positive loop gain around a feedback loop. That is, positive feedback is in phase with the input, in the sense that it adds to make the input larger.Positive feedback tends to cause system instability. When the loop gain is positive and above 1, there will typically be exponential growth, increasing oscillations or divergences from equilibrium. System parameters will typically accelerate towards extreme values, which may damage or destroy the system, or may end with the system latched into a new stable state. Positive feedback may be controlled by signals in the system being filtered, damped, or limited, or it can be cancelled or reduced by adding negative feedback.Positive feedback is used in digital electronics to force voltages away from intermediate voltages into '0' and '1' states. On the other hand, thermal runaway is a positive feedback that can destroy semiconductor junctions. Positive feedback in chemical reactions can increase the rate of reactions, and in some cases can lead to explosions. Positive feedback in mechanical design causes tipping-point, or 'over-centre', mechanisms to snap into position, for example in switches and locking pliers. Out of control, it can cause bridges to collapse. Positive feedback in economic systems can cause boom-then-bust cycles. A familiar example of positive feedback is the loud squealing or howling sound produced by audio feedback in public address systems: the microphone picks up sound from its own loudspeakers, amplifies it, and sends it through the speakers again.".
- Positive_feedback thumbnail Herdwick_Stampede.jpg?width=300.
- Positive_feedback wikiPageID "213354".
- Positive_feedback wikiPageRevisionID "604366981".
- Positive_feedback hasPhotoCollection Positive_feedback.
- Positive_feedback subject Category:Control_theory.
- Positive_feedback subject Category:Cybernetics.
- Positive_feedback subject Category:Electronic_feedback.
- Positive_feedback subject Category:Theories_of_history.
- Positive_feedback comment "Positive feedback is a process in which the effects of a small disturbance on a system include an increase in the magnitude of the perturbation. That is, A produces more of B which in turn produces more of A. In contrast, a system in which the results of a change act to reduce or counteract it has negative feedback.Mathematically, positive feedback is defined as a positive loop gain around a feedback loop.".
- Positive_feedback label "Meekoppeling".
- Positive_feedback label "Positive Rückkopplung".
- Positive_feedback label "Positive feedback".
- Positive_feedback label "Realimentación positiva".
- Positive_feedback label "Sprzężenie zwrotne dodatnie".
- Positive_feedback label "Положительная обратная связь".
- Positive_feedback label "ポジティブフィードバック".
- Positive_feedback label "正回饋".
- Positive_feedback sameAs Positive_Rückkopplung.
- Positive_feedback sameAs Realimentación_positiva.
- Positive_feedback sameAs ポジティブフィードバック.
- Positive_feedback sameAs 양성_피드백.
- Positive_feedback sameAs Meekoppeling.
- Positive_feedback sameAs Sprzężenie_zwrotne_dodatnie.
- Positive_feedback sameAs m.01f7tg.
- Positive_feedback sameAs Q918004.
- Positive_feedback sameAs Q918004.
- Positive_feedback wasDerivedFrom Positive_feedback?oldid=604366981.
- Positive_feedback depiction Herdwick_Stampede.jpg.
- Positive_feedback isPrimaryTopicOf Positive_feedback.
