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'''Electronic''' [[Electronic circuitscircuit]]s and [[Electronic componentscomponent]]s can be divided into two groups: [[analog]] and [[digital]]. A particular device may consist of circuitry that has one or the other or a mix of the two.<ref name="we">[[Wikipedia:Electronics]]</ref>
A linear circuit is one in which, for a [[Sine wavesinusoidal]] input voltage of [[frequency]] ''f'', any steadystate output of the circuit (the [[Electric currentcurrent]] through any component, or the [[voltage]] between any two points) is also sinusoidal with frequency ''f''. Note that the output need not be [[Phase (waves)in phase]] with the input.<ref>''Linear circuit design handbook'' by Hank Zumbahlen, Newnes, 2008, ISBN
==Construction methods==
