Text: The effect of feeding back of currents from one circuit to another as in the case of a regenerative circuit (q.v.). Generally the expression "feed-back effect" refers to an undesired feed-back. This may be the action of radio frequency components of the currents present in one part of a circuit being fed back to another part of the circuit due to the coupling effect of various coils or other devices used in the circuit.

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Source: 190