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How does transistor work as an amplifier?

How does transistor work as an amplifier?

A transistor acts as an amplifier by raising the strength of a weak signal. The DC bias voltage applied to the emitter base junction, makes it remain in forward biased condition. Thus a small input voltage results in a large output voltage, which shows that the transistor works as an amplifier.

How can I make a transistor amplifier?

Step 2: Circuiting

  1. First place transistor on breadboard .
  2. Insert resistor at pin 1 and 2 of transistor .
  3. Insert positive terminal of capacitor at pin1 of transistor .
  4. Insert one wire of 3.5 mm jack at negative terminal of capacitor.
  5. Insert remain wire of 3.5 mm jack at pin3.
  6. Insert one wire of speaker at pin2 .

What are the main parts of a transistor amplifier circuit?

The various prominent circuit elements and their functions are as described below.

  • Biasing Circuit.
  • Input Capacitor C.
  • Coupling Capacitor C.
  • Emitter by-pass capacitor C.
  • The Load resistor R.
  • Base Current.
  • Collector Current.
  • Emitter Current.

How does a transistor amplify current?

Transistors are normally used as amplifiers. The small current travels from the voltage source into the base of the transistor. A current at the base turns on the transistor. The current is then amplified and travels from the emitter of the transistor to the collector.

What are the 3 parts of a transistor?

There are typically three electrical leads in a transistor, called the emitter, the collector, and the baseā€”or, in modern switching applications, the source, the drain, and the gate.

Are all transistors amplifiers?

All transistors can be used as amplifiers. Amplifiers require the transistor to work in the active region. So the transistors effiency to work as a amplifier depends on its active region.

Does a transistor amplify current or voltage?

Transistor is a current controlled current device. So it amplifies current and not voltage. But it is also impossible to introduce current in a transistor without any voltage. Hence, we bias the transistor properly such that we can provide input current for amplification.

How transistor works as a switch?

One of the most common uses for transistors in an electronic circuit is as simple switches. In short, a transistor conducts current across the collector-emitter path only when a voltage is applied to the base. When no base voltage is present, the switch is off. When base voltage is present, the switch is on.

What is the basic transistor amplifier circuit?

The basic transistor amplifier circuit is indicated below: It is called a “common emitter” amplifier since the emitter is common to both the input circuti and the output circuit. There are additionally three capacitors but they do not play a role in the basic transistor amplifier design which mainly involves setting DC voltages.

What are the active components of the transistor circuit board?

Transistors are the active components used on this circuit board. The power source is the external power supply. Five amplifier circuit blocks, which can be configured for seven different circuits, are present on the TRANSISTOR AMPLIFIER CIRCUITS circuit board. The five amplifier circuit blocks are the: COMMON BASE / EMITTER circuit block

Why do we use a transistor as an amplifier?

One of the key characteristics of a transistor is that it can be used as an amplifier. Transistors can act as amplifiers while they are functioning in the active region or when it is correctly biased. The need for transistor as an amplifier arises when we want to increase or amplify the input signal.

What is input impedance of a transistor amplifier?

Input impedance: Input impedance is the impedance seen by the input voltage source when it is connected to the input of the transistor amplifier. In order to prevent the transistor amplifier circuit from loading the input voltage source, the transistor amplifier circuit must have high input impedance.

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