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Transistors

An electrical signal can be amplified by using a device which allows a small current or voltage to control the flow of a much larger current form a dc power source. transistors are the basic device providing control of this kind. there are two general types of transistors bipolar and field-effect. Very roughly the difference between these two types is that for bipolar devices an input current controls the large current flow through the device while for field-effect transistors an input voltage provides the control.