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A transistor has three sections, an emitter, base, and collector. By extracting a small number of electrons from the base, a large # of electrons can flow across the transistor from the emitter, thru the circuit, and back to the collector.

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14y ago
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13y ago

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.

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12y ago

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.

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11y ago

A transistor is a device that controls a large current with a small current. If it has an Hfe parameter of 50, then a 1 mA AC input current to it's base will cause a 50 mA AC current component at it's collector.

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11y ago

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.

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13y ago

As an amplifier, the amount of current a transistor conducts at any instant will vary in a manner which depends on the instantaneous value of the varying voltage that is applied to the base.

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9y ago

The red line goes down and the blue line just goes all the way up. Cool right?

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13y ago

A transistor does not act as an amplifier. It is used as a component in an amplifier circuit.

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12y ago

for amplify we use common collector biasing and take high input resistance and low output resistance

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Q: How a transistor acts as an amplifier?
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Related questions

How transistor acts as a amplifier?

A transistor does not act as an amplifier. It is used as a component in an amplifier circuit.


When transistor acts as an amplifier then does its output voltage increase or decrease?

That depends on both the input signal and the type of amplifier the transistor is used in.


How does transistor acts as an amplifier?

When transformer is used in step up mode then we can use transformer as amplifire


How does transistor acts an amplifier?

When transformer is used in step up mode then we can use transformer as amplifire


When a PNP transistor is connected in a circuit it can be used as a power amplifier because?

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.


What is the working of a Darlington 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.


What component is typically used as an amplifier?

A transistor


Why the gain of pnp transistor is low?

it doesn't have to be. depends on design of amplifier using transistor.


What configuration commonly employed in bipolar transistor amplifier?

Common Emitter - Class A Amplifier.


Difference between cascode and cascade 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.


Why a transistor is used as a amplifier and switch?

transistor has 2 output 1 and 0 so can be used as a switch


What is the purpose of the Unijunction Transistor?

A Unijunction Transistor is a transistor that acts solely as a switch.