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Brief Description on 2N Transistor 2N is a NPN transistor hence the collector and emitter will be left open Reverse biased when the base pin is held at ground and will be closed Forward biased when a signal is provided to base pin. The maximum amount of current that could flow through the Collector pin is mA, hence we cannot connect loads that consume more than mA using this transistor. To bias a transistor we have to supply current to base pin, this current IB should be limited to 5mA by using a transistor to the base pin.
When this transistor is fully biased then it can allow a maximum of mA to flow across the collector and emitter. This stage is called Saturation Region. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region and the Base Emitter voltage could be around mV. But it comes in a metal can package and can operate on voltages slightly higher than what a 2N can handle.
Overall it is just another small signal transistor which is commonly used in switching and amplifying circuits. So if you looking for an NPN transistor that could switch loads or for decent amplification then 2N might the right choice for your project.
Since transistor is of NPN the load to be switched should be connected to the collector and the emitter should be connected to the ground as show in the figure below. Another important thing to keep in mind, while using a transistor as switch is the base resistor. This resistor is connected to the base pin of the transistor to limit the current flowing through the base.
As we know the transistor is a current controlled device meaning, we have pass some current IB thorough the base of the transistor to turn it on. The value of this current can be calculated by the required amount of current that will be consumed by the load. Here lets us assume the load here consumes around mA maximum so our collector current IC mA. In our case for a collector current of mA we have to pass a base current of 16mA.
But this calculation will lead to the closest value to start with. Amplifier modules like Audio amplifiers, signal Amplifier etc.. Component Datasheet.
2N2270 Datasheet, Equivalent, Cross Reference Search