Transistors, at least the typical bi-junction transistor, actually amplify current. We set them up in a voltage divider circuit that converts current gain into voltage gain.
The simple explanation is that a small delta current on base-emitter causes a larger delta current on collector-emitter. The gain is either hFe or collector resistance divided by emitter resistance, whichever is less.
There are three pins on a transistor. One is hooked to the input signal. One to the power supply, and the third to ground. (These have different names depending on whether the particular device in your hand is a bipolar transistor or a field-effect transistor.) The pin hooked to the input signal controls the amount of voltage allowed to pass from the power supply pin to the ground pin.
So, basically, to amplify an input signal you feed more power into the "power supply" pin on the transistor than you are feeding into the "input" pin.
You don't want a huge amount of difference between the input and output on a transistor because it'll distort if you ask it for much, so a really high-powered transistor amp has multiple stages. That's one large difference between designing a transistor amp and a tube amp: a tube will give you a lot more amplification in one stage before it distorts. Prime example: the Marshall 2203 amplifier head, which is the most popular heavy-metal guitar amp head around. It's a 100-watt amplifier that contains one stage of preamplification with two tubes and one power amplification stage with four tubes. If that was a transistor amp it'd have at least 50 transistors in it. Another example, and a better one at that, is the 4CX35000 radio tube...which will amplify a 1750-watt input to 35,000 watts in one stage. I love solid state devices for their low power consumption, reliability and low heat, but if you're looking for a lot of gain in very few devices, tubes have always been the way to go.
In a transistor, a small current in the base-emitter circuit stimulates a significantly larger current in the collector-emitter circuit by breaking down the barrier in internal diode junctions. External resistor networks may be used to regulate these currents and produce larger voltages from smaller ones.
That depends on both the input signal and the type of amplifier the transistor is used in.
it doesn't have to be. depends on design of amplifier using transistor.
Biasing is necessary in a transistor circuit to keep the transistor working. Without proper biasing, the circuit will fail
at full input, if the transistor is working, the value of capacitor will be 0.
dinosaurs
A transistor does not act as an amplifier. It is used as a component in an amplifier circuit.
That depends on both the input signal and the type of amplifier the transistor is used in.
When transformer is used in step up mode then we can use transformer as amplifire
When transformer is used in step up mode then we can use transformer as amplifire
A PNP transistor has no advantage or disadvantage over an NPN transistor in its ability as an amplifier. Rather, the current-handling capacities of the transistor determine if it's usable as an amplifier.
it is a combination of two transistors connected in series. the emitter of transistor t1 is connected to the base of transistor t2 . now the total circuit acts as a single transistor. this combination will gives high gain, as the gain is multiplied.
A transistor
it doesn't have to be. depends on design of amplifier using transistor.
Common Emitter - Class A Amplifier.
cascade: the output of one amplifier stage is connected to the input of another amplifier stages, it's also connected in series. cascode: it said to be cascode, when it has one transistor on the top of another where a common emitter transistor drives a common base transistor.
transistor has 2 output 1 and 0 so can be used as a switch
A Unijunction Transistor is a transistor that acts solely as a switch.