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=== Mechanical ===
In a few specialist applications, such as the [[mechanical filter]]s in high-end radio transmitters (marine, military, amateur radio), electronic circuits can be implemented as mechanical components; this is done largely because of the high quality of the mechanical resonators. They are used in the [[radio frequency]] band (below microwave frequencies), where waveguides might otherwise be used. Mechanical circuits can also be implemented, in whole or in part, as distributed element circuits. The frequency at which the transition to distributed element design becomes feasible (or necessary) is much lower with mechanical circuits. This is because the speed at which signals travel through mechanical media is much lower than the speed of electrical signals.<ref>{{multiref|Taylor & Huang pp. 353–358.|Johnson (1983), p. 102.|Mason (1961).|Johnson ''et al.'' (1971), pp. 155, 169.}}
== Circuit components ==
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