How Transistor Amplifies
How Transistor Amplifies-Fig-1 shows a single stage transistor amplifier. When a weak a.c. signal is given to
the base of transistor, a small base current (which is a.c.) starts flowing.
Due to transistor action, a much larger ( times the base current) a.c. current flows through the collector load R C.
As the value of R C is quite high (usually 4 kΩ), therefore, a large voltage appears across R C. Thus, a weak signal applied in the base circuit appears in amplified form n the collector circuit. It is in this way that a transistor acts as an amplifier.
The action of transistor amplifier can be beautifully explained by referring to Fig.
10.1. Suppose a change of 0.1 V in signal voltage produces a change of 2 mA in the
collector current. Obviously, a signal of only 0.1V applied to the base will give an output
voltage level of the signal from 0.1V to 10V i.e. voltage amplification or stage gain is
আমাদের অন্যান্য পোষ্টসমূহ:
To visit our another website, click here...
BCS Preliminary: All Bcs Question, Answer and Solve.