Do you need resistors for transistors?

Do you need resistors for transistors?

The resistors are used as a means of generating voltage drops and thereby pulling the transistor into the desired operating region. because you need to limit the current to semiconductor terminals. otherwise, the transistors will be damaged.

For what use it is better a variable resistor?

Variable resistors are widely used in electric circuits to adjust the value of current or voltage, since the resistance of variable resistors can be set to a certain value. Variable resistors allow you to adjust the value of voltage by changing the resistance and keeping current constant .

What is the difference between transistor and amplifier?

A transistor is a semiconductor component. Transistor can be used in various different applications. It can be used to create amplifiers, but it can also be used as a switch. Amplifier is any device that amplifies the power or voltage of a signal.

What is a transistor amplifier?

A transistor amplifier is an electronic circuit that uses a semi-conducting transistor instead of a tube or integrated circuit chip to amplify electrical signals. Typically used in audio applications, a transistor amplifier provides excellent performance in a relatively small package.

How can a transistor be used as a resistor?

Of course the transistor can be used as a resistor that is exactly what it is – a controllable resistance. The resistance is between the collector and emitter – we control it by applying suitable signals to the base. However there is no requirement for that resistance to be high or low, it is up to us to set its value.

Why does transistor base need a resistor?

A small amount of current flows through the PNP transistor, through the 1 k? resistor, and through the NPN transistor to ground. That small current switches a larger current that can flow through the LEDs. “base” resistor, so called because it limits the amount of current that flows through the base of the transistor.

What is the difference between resistor and variable resistor?

Variable resistor A resistor limits the passage of electrical current. A fixed resistor has a resistance that does not change. The resistance of this resistor is changed by moving the position of a slider. A variable resistor is used in some dimmer switches and volume controls.

When might you use a variable resistor rather than a fixed resistor?

Circuits with LEDs use fixed resistors to limit the current, thus protecting the LED from damage. A variable resistor, commonly called a potentiometer (pot for short), allows you to adjust the resistance from virtually zero ohms to a factory-determined maximum value.

When transistor is used as an amplifier it increases?

A transistor will act as an amplifier by raising the strength of the input signal. A small change in input signal can lead to an appreciable change in the output when there is low resistance in the input circuit.

Is a transistor like a variable resistor?

Yes, a transistor is like a variable resistor, in that the resistance between collector-emitter or drain-source is variable. It’s like a valve, and either allows current to flow or blocks it from flowing. (I don’t like it when people say “transistors are amplifiers”.

How is a transistor set up as an amplifier?

The figure below shows how the transistor is set up when it is connected in a circuit as an amplifier. In the figure given above, the input is connected in forward-biased and the output is connected in reverse-biased. The input signal is applied on the base-emitter junction and the output is taken through the load in emitter-collector junction.

Why do we use two resistors in a common emitter amplifier?

The value of this resistor is chosen so that Q-point lies halfway along the load line of the transistors at the quiescent operating point of the amplifiers. By Useing two resistors as a potential divider network, the transistor base used in a common emitter amplifier is biased.

How does a transistor amplify a weak signal?

Overall, the weak signal is thus amplified in the collector circuit. However, to work as an amplifier, the transistor has to work in the active region of the output voltage versus input voltage curve as seen in the figure below.

https://www.youtube.com/watch?v=UVLUByGb-tY