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What happens to the collector voltage of an NPN transistor if the base current is increased?
It is an exponential relationship that is described by the Ebers-Moll equations. An increase in this voltage results in increased currents in both the base and the collector, and indeed, an increase in base current causes an increase in B-E voltage.
What is voltage gain in NPN transistor?
An NPN Transistor has a DC current gain, (Beta) value of 200. One other point to remember about NPN Transistors. The collector voltage, ( Vc ) must be greater and positive with respect to the emitter voltage, ( Ve ) to allow current to flow through the transistor between the collector-emitter junctions.
How is the NPN transistor related to the emitter?
In a common emitter NPN transistor the relation between collector current and emitter current is given as. I C = β I B. In active region the NPN transistor acts as a good amplifier. In common emitter NPN transistor total current flow through the transistor is defined as the ratio of collector current to the base current IC/IB.
What do you need to know about bipolar NPN transistors?
One other point to remember about Bipolar NPN Transistors. The collector voltage, ( Vc ) must be greater and positive with respect to the emitter voltage, ( Ve ) to allow current to flow through the transistor between the collector-emitter junctions.
How are NPN transistors used in Darlington circuit?
Used in the Darlington pair circuits to amplify weak signals. NPN transistors are used in the applications where there is a need to sink a current. Used in some classic amplifier circuits, such as ‘push-pull’ amplifier circuits.
What are the properties of a bipolar junction transistor?
One of the most important properties of the Bipolar Junction Transistor is that a small base current can control a much larger collector current. Consider the following example. A bipolar NPN transistor has a DC current gain, ( Beta) value of 200. Calculate the base current Ib required to switch a resistive load of 4mA.