GUITAR AMPILFIER

A guitar amplifier ( or guitar amp) is an elctronic amplifier designed to amplify the elctrical signal of an elctricor acoustic guitar so that it will produce sound through aloudspeaker.Most guitar amplifiers can also modify the instrument's tone by emphasizing or de-emphasizing certain frequiencies and adding elctronic effects.Vibrations of the strings are ''picked up'' by a suitable microphone.For electric guitars,strings are all made of metal, and the pickup works by elctro-magnetic induction. Acoustic guitars have a normal microphone,designed to convert acoustic vibrations into an electrical signal, but usually the do so from direct contact with the strings ( replacing the guitar's bridge) or with the guitar's body, rather than having a membrane like general-purpose microphones.