![]() List some application of transistor when working as an amplifier: The transistor works as an amplifier when it operates in active mode with proper biasing. In characteristic response, the center portion indicates the active region. The effect of output voltage V CE on the I C is negligible for the active region. Biasing the output junction, the collector current I C increases proportionally to the base current. The BE junction is forward biased, so it acts as diode &therefore I B currents increase. When selecting the proper operating point (Q) the transistor can be used as an amplifier. In active mode, the input base emitter junction is forward biased and the output collector emitter junction is reverse biased. The transistor acts as a closed switch when a positive signal is applied to its base, turning “ON” and allowing the maximum amount of circuit current to pass through the component.The transistor becomes “OFF,” operating like an open switch, when a zero signal is applied to the base, and no collector current flows.The transistor can function as a solid state “single-pole single-throw” (SPST) switch in following case Symbols of NPN Transistor & PNP Transistor The transistor symbol for NPN and PNP is shown below. Transistor is also called as BJT – Bipolar Junction Transistor. This is called a NPN transistor and a PNP transistor, respectively. It is consisting of either 2 N type & one P type layers of semiconductor materials or two P Type & one N type layers of semiconductor materials. Transistor is a three-layer semiconductor device. Transistor Cut-off, Saturation, Active Region Transistor What is the difference between a cut-off region and a saturation region?.How do you know if a Transistor is saturated or active?.What is the value of IC when transistor is said to be in cut-off region?.Key Questions related to Transistor Modes.Different Modes of operation of transistor.How Common Emitter amplifier differs from Common Base Amplifier?. ![]() ![]() ![]() List some application of transistor when working as an amplifier:.Transistor Cut-off, Saturation, Active Region. ![]()
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