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represents perfect linearity, and means that any given percentage
increase or decrease of input changes the output in exactly the same
proportion. Transistors are examples of non-linear devices, as
shown by the curvature in their characteristics (Fig. 10.12, etc.).
Judging from an output-input graph, the most obvious effect of
non-linearity might seem to be that the volume of sound produced
would not be in exact proportion to the original. It is true that
reducing the signal strength at the detector to one-tenth is likely to
reduce the a.f. output to far less than one-tenth, because of the
bottom bend (Sec. 18.11). But that is about th